Change font size default from 12 to 14

Summary: trivial change of the default font size from 12 to 14 to make it backward compatible with current version of RN

Reviewed By: shergin

Differential Revision: D13108543

fbshipit-source-id: e5e384c4459f2c87ee9589c4e00a0ab5d0c8a06a

Author: mdvacca

ReactCommon/fabric/attributedstring/TextAttributes.cpp

@@ -158,7 +158,7 @@ TextAttributes TextAttributes::defaultTextAttributes() {
     // Non-obvious (can be different among platforms) default text attributes.
     textAttributes.foregroundColor = blackColor();
     textAttributes.backgroundColor = clearColor();
-    textAttributes.fontSize = 12.0;
+    textAttributes.fontSize = 14.0;
     return textAttributes;
   }();
   return textAttributes;