Fix implicit conversion warning in RCTInspector.mm (facebook#23577)

Summary:
Fixes Xcode warning: `Implicit conversion loses integer precision: 'NSInteger' (aka 'long') to 'int'`.

[iOS] [Fixed] - Fix implicit conversion warning in RCTInspector.mm
Pull Request resolved: facebook#23577

Differential Revision: D14169498

Pulled By: hramos

fbshipit-source-id: c877a46b2b583c96bc977308ed28bdc0b0f2b517

React/Inspector/RCTInspector.mm

@@ -80,7 +80,7 @@ @implementation RCTInspector
 + (RCTInspectorLocalConnection *)connectPage:(NSInteger)pageId
                          forRemoteConnection:(RCTInspectorRemoteConnection *)remote
 {
-  auto localConnection = getInstance()->connect(pageId, std::make_unique<RemoteConnection>(remote));
+  auto localConnection = getInstance()->connect((int)pageId, std::make_unique<RemoteConnection>(remote));
   return [[RCTInspectorLocalConnection alloc] initWithConnection:std::move(localConnection)];
 }