[modules] Use cError() as well

- Switch KPMHelpers to using Calamares logging instead of qDebug()

src/libcalamaresui/Branding.cpp

@@ -291,7 +291,7 @@ Branding::setGlobals( GlobalStorage* globalStorage ) const
 void
 Branding::bail( const QString& message )
 {
-    cLog() << "FATAL ERROR in"
+    cError() << "FATAL in"
            << m_descriptorPath
            << "\n" + message;
     ::exit( EXIT_FAILURE );

src/modules/partition/core/KPMHelpers.cpp

@@ -29,6 +29,8 @@
 #include <kpmcore/backend/corebackendmanager.h>
 #include <kpmcore/fs/luks.h>
 
+#include "utils/Logger.h"
+
 #include <QDebug>
 
 
@@ -46,7 +48,7 @@ initKPMcore()
     QByteArray backendName = qgetenv( "KPMCORE_BACKEND" );
     if ( !CoreBackendManager::self()->load( backendName.isEmpty() ? CoreBackendManager::defaultBackendName() : backendName ) )
     {
-        qWarning() << "Failed to load backend plugin" << backendName;
+        cWarning() << "Failed to load backend plugin" << backendName;
         return false;
     }
     s_KPMcoreInited = true;
@@ -155,7 +157,7 @@ createNewEncryptedPartition( PartitionNode* parent,
                                                       ) );
     if ( !fs )
     {
-        qDebug() << "ERROR: cannot create LUKS filesystem. Giving up.";
+        cError() << "cannot create LUKS filesystem. Giving up.";
         return nullptr;
     }
 

src/modules/partition/core/PartUtils.cpp

@@ -281,11 +281,11 @@ runOsprober( PartitionCoreModule* core )
     osprober.start();
     if ( !osprober.waitForStarted() )
     {
-        cDebug() << "ERROR: os-prober cannot start.";
+        cError() << "os-prober cannot start.";
     }
     else if ( !osprober.waitForFinished( 60000 ) )
     {
-        cDebug() << "ERROR: os-prober timed out.";
+        cError() << "os-prober timed out.";
     }
     else
     {