Un-reverse condition (#43385)

(cherry picked from commit 64f8bbb)

Author: amcasey

src/compiler/sys.ts

@@ -1198,7 +1198,7 @@ namespace ts {
 
             const platform: string = _os.platform();
             const useCaseSensitiveFileNames = isFileSystemCaseSensitive();
-            const realpathSync = useCaseSensitiveFileNames ? _fs.realpathSync : (_fs.realpathSync.native ?? _fs.realpathSync);
+            const realpathSync = useCaseSensitiveFileNames ? (_fs.realpathSync.native ?? _fs.realpathSync) : _fs.realpathSync;
 
             const fsSupportsRecursiveFsWatch = isNode4OrLater && (process.platform === "win32" || process.platform === "darwin");
             const getCurrentDirectory = memoize(() => process.cwd());