Don't let CodeLocals be nullable in reference finding code

Co-authored-by: zivmaor <63353113+zivmaor@users.noreply.github.com>

UndertaleModTool/Windows/FindReferencesTypesDialog/UndertaleResourceReferenceMethodsMap.cs

@@ -617,7 +617,7 @@ IEnumerable<object[]> GetExtnFunctions()
                             if (objSrc is not UndertaleString obj)
                                 return null;
 
-                            var codeLocals = data.CodeLocals?.Where(x => x.Name == obj || x.Locals.Any(l => l.Name == obj));
+                            var codeLocals = data.CodeLocals.Where(x => x.Name == obj || x.Locals.Any(l => l.Name == obj));
                             if (codeLocals.Any())
                                 return new() { { "Code locals", checkOne ? codeLocals.ToEmptyArray() : codeLocals.ToArray() } };
                             else