removing dropshadow on messageView layer

This dropshadow only appeared when the background of the IAM was transparent. This is not an intentional visual feature so we are removing it.

Author: emawby

iOS_SDK/OneSignalSDK/Source/OSInAppMessageViewController.m

@@ -180,12 +180,6 @@ - (void)setupInitialMessageUI {
 
     [self.messageView setupWebViewConstraints];
 
-    // Add drop shadow to the messageView
-    self.messageView.layer.shadowOffset = CGSizeMake(0, 3);
-    self.messageView.layer.shadowColor = [[UIColor blackColor] CGColor];
-    self.messageView.layer.shadowRadius = 3.0f;
-    self.messageView.layer.shadowOpacity = 0.55f;
-    
     [self.view addSubview:self.messageView];
 
     [self addConstraintsForMessage];