[partition] Don't run bool allowManualPartitioning through GS

It's a bit over-wrought to store a bool in a QVariant in GS for
consumption **only** by ChoicePage, so drop that GS key and store
it locally.

src/modules/partition/Config.cpp

@@ -220,14 +220,6 @@ Config::setEraseFsTypeChoice( const QString& choice )
     }
 }
 
-
-bool
-Config::allowManualPartitioning() const
-{
-    Calamares::GlobalStorage* gs = Calamares::JobQueue::instance()->globalStorage();
-    return gs->value( "allowManualPartitioning" ).toBool();
-}
-
 static void
 fillGSConfigurationEFI( Calamares::GlobalStorage* gs, const QVariantMap& configurationMap )
 {
@@ -272,9 +264,7 @@ Config::setConfigurationMap( const QVariantMap& configurationMap )
     }
     setSwapChoice( m_initialSwapChoice );
 
-    Calamares::GlobalStorage* gs = Calamares::JobQueue::instance()->globalStorage();
-    gs->insert( "allowManualPartitioning",
-                CalamaresUtils::getBool( configurationMap, "allowManualPartitioning", true ) );
+    m_allowManualPartitioning = CalamaresUtils::getBool( configurationMap, "allowManualPartitioning", true );
 
     if ( configurationMap.contains( "availableFileSystemTypes" ) )
     {
@@ -288,6 +278,7 @@ Config::setConfigurationMap( const QVariantMap& configurationMap )
         }
     }
 
+    Calamares::GlobalStorage* gs = Calamares::JobQueue::instance()->globalStorage();
     m_requiredPartitionTableType = CalamaresUtils::getStringList( configurationMap, "requiredPartitionTableType" );
     gs->insert( "requiredPartitionTableType", m_requiredPartitionTableType );
 

src/modules/partition/Config.h

@@ -112,9 +112,8 @@ public:
 
     QString eraseFsType() const { return m_eraseFsTypeChoice; }
 
-
-    ///@brief Is manual partitioning allowed (not explicitly disnabled in the config file)?
-    bool allowManualPartitioning() const;
+    ///@brief Is manual partitioning allowed (not explicitly disabled in the config file)?
+    bool allowManualPartitioning() const { return m_allowManualPartitioning; }
 
 public Q_SLOTS:
     void setInstallChoice( int );  ///< Translates a button ID or so to InstallChoice
@@ -138,6 +137,8 @@ private:
     InstallChoice m_installChoice = NoChoice;
     qreal m_requiredStorageGiB = 0.0;  // May duplicate setting in the welcome module
     QStringList m_requiredPartitionTableType;
+
+    bool m_allowManualPartitioning = true;
 };
 
 /** @brief Given a set of swap choices, return a sensible value from it.