driconf: fix force_gl_vendor description
The option is not a toggle to "allow GPU vendor to be overridden", it is the override.
Fixes: dca119f1 ("mesa/gallium: add dric option to allow overriding GL vendor string")
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The option is not a toggle to "allow GPU vendor to be overridden", it is the override.
Fixes: dca119f1 ("mesa/gallium: add dric option to allow overriding GL vendor string")