iOS: Use right DPI for all iPad Minis, not just the WiFi version

The 3G versions are iPad2,6 and iPad2,7.

Change-Id: I43a00e84535d494550bca8a533a6d16af4be6722
Reviewed-by: Ian Dean <ian@mediator-software.com>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

src/plugins/platforms/ios/qiosscreen.mm

@@ -136,7 +136,7 @@ QIOSScreen::QIOSScreen(unsigned int screenIndex)
 
     int unscaledDpi = 163; // Regular iPhone DPI
     if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad
-        && deviceIdentifier != QStringLiteral("iPad2,5") /* iPad Mini */) {
+        && !deviceIdentifier.contains(QRegularExpression("^iPad2,[567]$")) /* excluding iPad Mini */) {
         unscaledDpi = 132;
     };