Let the ability to use global-action with lowercases

Author: Benjamin-Loison

app/src/main/java/com/termux/api/apis/AccessibilityAPI.java

@@ -195,6 +195,6 @@ private static void type(String toType) {
     }
 
     private static void performGlobalAction(String globalAction) throws NoSuchFieldException, IllegalAccessException {
-        TermuxAccessibilityService.instance.performGlobalAction((int)AccessibilityService.class.getDeclaredField("GLOBAL_ACTION_" + globalAction).get(null));
+        TermuxAccessibilityService.instance.performGlobalAction((int)AccessibilityService.class.getDeclaredField("GLOBAL_ACTION_" + globalAction.toUpperCase()).get(null));
     }
 }