[iOS] Unify openURL methods and mark the old one deprecated (#3489)

Make sure both methods offer the same behavior and mark the old one as
deprecated so SDK users get a warning.

ios/README.md

 }
 ```
 
+NOTE: The latter is deprecated.
+
 ### JitsiMeetViewDelegate
 
 This delegate is optional, and can be set on the `JitsiMeetView` instance using

ios/sdk/src/JitsiMeetView.h

 + (BOOL)application:(UIApplication * _Nonnull)application
             openURL:(NSURL * _Nonnull)URL
   sourceApplication:(NSString * _Nullable)sourceApplication
-         annotation:(id _Nullable)annotation;
+         annotation:(id _Nullable)annotation __deprecated;
 
 - (void)loadURL:(NSURL * _Nullable)url;
 

ios/sdk/src/JitsiMeetView.m

 + (BOOL)application:(UIApplication *)app
             openURL:(NSURL *)url
             options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options {
-    return
-        [Dropbox application:app openURL:url options:options]
-            || [RCTLinkingManager application:app openURL:url options:options];
-}
+    if ([Dropbox application:app openURL:url options:options]) {
+        return YES;
+    }
 
-+ (BOOL)application:(UIApplication *)application
-            openURL:(NSURL *)url
-  sourceApplication:(NSString *)sourceApplication
-         annotation:(id)annotation {
     // XXX At least twice we received bug reports about malfunctioning loadURL
     // in the Jitsi Meet SDK while the Jitsi Meet app seemed to functioning as
     // expected in our testing. But that was to be expected because the app does
         return YES;
     }
 
-    return [RCTLinkingManager application:application
-                                  openURL:url
-                        sourceApplication:sourceApplication
-                               annotation:annotation];
+    return [RCTLinkingManager application:app openURL:url options:options];
+}
+
++ (BOOL)application:(UIApplication *)application
+            openURL:(NSURL *)url
+  sourceApplication:(NSString *)sourceApplication
+         annotation:(id)annotation {
+    return [self application:application openURL:url options:@{}];
 }
 
 #pragma mark Initializers