Also weigh preference of context in present-method selection #171
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#169 broke pyodide, this fixes it.
In #169 the canvas backend selects the present-method, but the preference of the context was not taken into account. With this PR that preference is also weighted.
The problem with the previous behavior is that 'screen' was normally preferred, which causes 'screen' to be selected with the pyodide backend and the bitmap context. But this means it would require wgpu-py, which is not loaded in the bitmap examples (and is not pyodide-ready yet).