render: Update the size/scale/viewport on moves, in addition to resizes #5501
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For OpenGL this means resetting the viewport state shadowing flag too.
Fixes #1504
Tested this against VVVVVV after remembering that macOS defaults to Metal (can you tell I don't do Mac stuff anymore...). The main bug was that the viewport flag needed to be reset on window changes, but the upper-level change is still important for DPI changes as well.