Make sure we can create a .xcode.env.local (#46060)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/46060

Closures in ruby don't need the `return` statement. They exit from the calling function!

## Changelog
[Internal] - fix .xcode.env.local.generation

Reviewed By: cortinico

Differential Revision: D61343918

fbshipit-source-id: 39073ead7ad596f48403a5c2d4c066d410355698

packages/react-native/scripts/cocoapods/utils.rb

@@ -241,7 +241,7 @@ class ReactNativePodsUtils
             node_binary = `type -a node`.split("\n").map { |path|
                 path.gsub!("node is ", "")
             }.select { |b|
-                return !b.start_with?("/var")
+                !b.start_with?("/var")
             }
 
             node_binary = node_binary[0]