fix(android): correctly handle semibold font

Author: farfromrefug

Diff for: plugin/platforms/android/java/com/nativescript/label/Font.java

@@ -103,6 +103,7 @@ public static int getIntFontWeight(String fontWeight) {
             case FontWeight.NORMAL:
                 return 400;
             case FontWeight.BOLD:
+            case "semibold":
                 return 500;
             case "thin":
                 return 100;