rn 0.55 ios compatibility

Author: iyegoroff

ios/RNTextGradientShadowView.m

@@ -91,7 +91,7 @@ - (void)uiManagerWillPerformMounting
           CGRect actualFrame;
 
           if ([gradientView useViewFrame]) {
-            CGRect viewFrame = [gradientView frame];
+            CGRect viewFrame = gradientView.layoutMetrics.frame;
             actualFrame = CGRectMake(0, 0, viewFrame.size.width, viewFrame.size.height);
 
           } else {