fix - fatal error for class not found

[nishitlangaliya]

While testing with other issue I found class Google_Maps_Builder_Core_Admin not found fatal error.

[DevinWalker]

@nishitlangaliya in the future please try to make your issues more descriptive so we can understand them when reading. For instance, this should have a screenshot of the "fatal" (not fetal - that's much different of an error...) error.

[nishitlangaliya]

@DevinWalker , Sure I will take care about it and will provide more description when creating an issue. I have made the requested changes in PR

Thanks