fix ios open settings

ios/Classes/PermissionManager.m

@@ -59,33 +59,18 @@
 }
 
 + (void)openAppSettings:(FlutterResult)result {
-    if (@available(iOS 8.0, *)) {
-        NSURL *url = [[NSURL alloc] initWithString:UIApplicationOpenSettingsURLString];
-        if (url == nil) {
-            result(@false);
-            return;
-        }
-        
     if (@available(iOS 10, *)) {
-            if (![UIApplication.sharedApplication canOpenURL:url]) {
-                result(@false);
-                return;
-            }
-            
-            NSDictionary *optionsKeyDictionary = @{UIApplicationOpenURLOptionUniversalLinksOnly: @true};
-            [[UIApplication sharedApplication]
-             openURL:url options:optionsKeyDictionary completionHandler:^(BOOL success) {
+        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]
+                                           options:[[NSDictionary alloc] init]
+                                 completionHandler:^(BOOL success) {
                                      result([[NSNumber alloc] initWithBool:success]);
                                  }];
-            return;
-        } else {
-            BOOL success = [[UIApplication sharedApplication] openURL:url];
+    } else if (@available(iOS 8.0, *)) {
+        BOOL success = [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
         result([[NSNumber alloc] initWithBool:success]);
-        }
-    }
-    
+    } else {
         result(@false);
-    
+    }
 }
 
 + (id)createPermissionStrategy:(PermissionGroup)permission {