[welcome] [partition] Rename GlobalStorage variable used for storage

- Change name passed into GS to use "GiB" instead of "GB", for
   consistency. This needs to be done in consumers as well.

src/modules/partition/core/PartUtils.cpp

@@ -284,7 +284,7 @@ canBeReplaced( Partition* candidate )
     bool ok = false;
     double requiredStorageGB = Calamares::JobQueue::instance()
                                     ->globalStorage()
-                                    ->value( "requiredStorageGB" )
+                                    ->value( "requiredStorageGiB" )
                                     .toDouble( &ok );
 
     qint64 availableStorageB = candidate->capacity();
@@ -356,7 +356,7 @@ canBeResized( Partition* candidate )
     bool ok = false;
     double requiredStorageGB = Calamares::JobQueue::instance()
                                     ->globalStorage()
-                                    ->value( "requiredStorageGB" )
+                                    ->value( "requiredStorageGiB" )
                                     .toDouble( &ok );
     // We require a little more for partitioning overhead and swap file
     double advisedStorageGB = requiredStorageGB + 0.5 + 2.0;

src/modules/partition/gui/ChoicePage.cpp

@@ -462,7 +462,7 @@ ChoicePage::applyActionChoice( ChoicePage::InstallChoice choice )
                 gs->value( "defaultFileSystemType" ).toString(),
                 m_encryptWidget->passphrase(),
                 gs->value( "efiSystemPartition" ).toString(),
-                CalamaresUtils::GiBtoBytes( gs->value( "requiredStorageGB" ).toDouble() ),
+                CalamaresUtils::GiBtoBytes( gs->value( "requiredStorageGiB" ).toDouble() ),
                 m_eraseSwapChoice
             };
 
@@ -560,7 +560,7 @@ ChoicePage::doAlongsideSetupSplitter( const QModelIndex& current,
 
     double requiredStorageGB = Calamares::JobQueue::instance()
                                     ->globalStorage()
-                                    ->value( "requiredStorageGB" )
+                                    ->value( "requiredStorageGiB" )
                                     .toDouble();
 
     // TODO: make this consistent

src/modules/partition/gui/ReplaceWidget.cpp

@@ -143,7 +143,7 @@ ReplaceWidget::onPartitionSelected()
     bool ok = false;
     double requiredSpaceB = Calamares::JobQueue::instance()
                             ->globalStorage()
-                            ->value( "requiredStorageGB" )
+                            ->value( "requiredStorageGiB" )
                             .toDouble( &ok ) * 1024 * 1024 * 1024;
 
     PartitionModel* model = qobject_cast< PartitionModel* >( m_ui->partitionTreeView->model() );

src/modules/welcome/checker/GeneralRequirements.cpp

@@ -216,7 +216,7 @@ GeneralRequirements::setConfigurationMap( const QVariantMap& configurationMap )
             m_requiredStorageGiB = 3.;
         }
 
-        Calamares::JobQueue::instance()->globalStorage()->insert( "requiredStorageGB", m_requiredStorageGiB );
+        Calamares::JobQueue::instance()->globalStorage()->insert( "requiredStorageGiB", m_requiredStorageGiB );
     }
     else
     {