[Android] Simplify onAttach for CPUSettingsFragment and VideoSettingsFragment

Source/Android/src/org/dolphinemu/dolphinemu/settings/CPUSettingsFragment.java

@@ -57,17 +57,9 @@ public final class CPUSettingsFragment extends PreferenceFragment
 	{
 		super.onAttach(activity);
 
-		// This makes sure that the container activity has implemented
+		// Cache the activity instance.
-		// the callback interface. If not, it throws an exception
-		try
-		{
 		m_activity = activity;
 	}
-		catch (ClassCastException e)
-		{
-			throw new ClassCastException(activity.toString());
-		}
-	}
 
 	@Override
 	public void onDestroy()

Source/Android/src/org/dolphinemu/dolphinemu/settings/VideoSettingsFragment.java

@@ -202,17 +202,9 @@ public final class VideoSettingsFragment extends PreferenceFragment
 	{
 		super.onAttach(activity);
 
-		// This makes sure that the container activity has implemented
+		// Cache the activity instance.
-		// the callback interface. If not, it throws an exception
-		try
-		{
 		m_activity = activity;
 	}
-		catch (ClassCastException e)
-		{
-			throw new ClassCastException(activity.toString());
-		}
-	}
 
 	@Override
 	public void onDestroy()