videosettings.cpp: use hw_caps->has_button_vformat

lib/hardware/coolstream/hardware_caps.h

@@ -37,6 +37,7 @@ typedef struct hw_caps
 	int display_can_set_brightness;
 	int display_has_statusline;
 	int has_button_timer;
+	int has_button_vformat;
 	char boxvendor[64];
 	char boxname[64];
 	char boxarch[64];