Disable vertex attrib arrays in overlay_gl (fixes #1298)

This is a fix for the OpenGL overlay which disables
and enables the vertex attrib arrays inside drawContext.
The problem it fixes is that some games leave some of
the arrays enabled between frames, which I think
(not an OpenGL expert) causes the input to the vertex
shader to essentially be arbitrary.
Transifex translation update

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Transifex translation update
Mode: default
Minimum percent translated: 0
Matched 29 languages