Fix InterpreterContext::updatePtr updating mLocals to the implicit ref's locals when interpreting a targeted global script (Fixes #3738)

The interpreter context of a targeted global script would point to the target's locals instead of the global script instance's locals when the target changed cell during script execution. Credit to scrawl for the solution.

apps/openmw/mwscript/interpretercontext.cpp

@@ -582,6 +582,7 @@ namespace MWScript
         if (!mReference.isEmpty() && base == mReference)
         {
             mReference = updated;
+            if (mLocals == &base.getRefData().getLocals())
                 mLocals = &mReference.getRefData().getLocals();
         }
     }