ios: added InAppBrowserStatusBarStyle preference (#728)

src/ios/CDVWKInAppBrowser.m

@@ -1055,8 +1055,13 @@ BOOL isExiting = FALSE;
 
 - (UIStatusBarStyle)preferredStatusBarStyle
 {
+    NSString* statusBarStylePreference = [self settingForKey:@"InAppBrowserStatusBarStyle"];
+    if (statusBarStylePreference && [statusBarStylePreference isEqualToString:@"lightcontent"]) {
+        return UIStatusBarStyleLightContent;
+    } else {
         return UIStatusBarStyleDefault;
     }
+}
 
 - (BOOL)prefersStatusBarHidden {
     return NO;