[gatsby] Compare location object instead of just pathname

[paulathevalley]

re: #3802

This PR compares window.location and location objects instead of just their pathnames.

Let me know if there is a better approach. Thanks!

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[KyleAMathews]

Please use the shallow-compare package as we're already using that so it require any extra code

gatsby/packages/gatsby/cache-dir/component-renderer.js

Line 6 in 3ab063f

import shallowCompare from "shallow-compare"

[KyleAMathews]

Thanks for jumping on a fix!

[KyleAMathews]

Thanks!

[KyleAMathews]

Comparing the window and router location objects didn't work as the window object has a bunch of other stuff on it. Instead it seems best to just compare the things we care about directly.

Put up a PR for this #4339

[jlengstorf]

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