Bug 1264666 - Remove nightly flags for native text selection handles r=snorp

mobile/android/app/mobile.js

@@ -867,11 +867,7 @@ pref("reader.toolbar.vertical", false);
 pref("toolkit.telemetry.unified", false);
 
 // Unified AccessibleCarets (touch-caret and selection-carets).
-#ifdef NIGHTLY_BUILD
 pref("layout.accessiblecaret.enabled", true);
-#else
-pref("layout.accessiblecaret.enabled", false);
-#endif
 
 // AccessibleCaret CSS for the Android L style assets.
 pref("layout.accessiblecaret.width", "22.0");