Revert "glfw: set raw_mouse_motion to true if cursor is disabled"

[castholm]

This reverts commit 8e091ce.

Closes #48

I don't think it makes a lot of sense to have setInputModeCursor have a behavior that is different from the upstream GLFW. If you need to change both the cursor and raw mouse motion modes, you should call both setInputModeCursor and setInputModeRawMouseMotion separately.

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