swap icons

...

 Changes to be committed:
	modified:   res/drawable-hdpi/ic_settings_performance.png
	modified:   res/drawable-hdpi/ic_settings_rom_control.png
	modified:   res/drawable-hdpi/ic_settings_themes.png
	modified:   res/drawable-mdpi/ic_settings_performance.png
	modified:   res/drawable-mdpi/ic_settings_rom_control.png
	modified:   res/drawable-mdpi/ic_settings_themes.png
	modified:   res/drawable-xhdpi/ic_settings_performance.png
	modified:   res/drawable-xhdpi/ic_settings_rom_control.png
	modified:   res/drawable-xhdpi/ic_settings_themes.png