Revert "macOS: Don't apply backing scale factor when using the CoreGraphics renderer"

This reverts commit 90d65375df.

modules/juce_gui_basics/native/juce_mac_NSViewComponentPeer.mm

@@ -852,13 +852,9 @@ public:
         float displayScale = 1.0f;
 
        #if defined (MAC_OS_X_VERSION_10_7) && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7)
-        if (! usingCoreGraphics)
-        {
-            NSScreen* screen = [[view window] screen];
-
-            if ([screen respondsToSelector: @selector (backingScaleFactor)])
-                displayScale = (float) screen.backingScaleFactor;
-        }
+        NSScreen* screen = [[view window] screen];
+        if ([screen respondsToSelector: @selector (backingScaleFactor)])
+            displayScale = (float) screen.backingScaleFactor;
        #endif
 
        #if USE_COREGRAPHICS_RENDERING && JUCE_COREGRAPHICS_RENDER_WITH_MULTIPLE_PAINT_CALLS