Fix numpy float/int error when using CameraAndroid.decode_frame

[ewen-lbh]

the call to np.reshape with (h + h/2, ...) could lead to reshaping with a float. This is fixed by using h + h//2 instead

Closes #8752

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[ewen-lbh]

I'd also like to backport this to 2.*, if you still do releases, as we are using the latest stable Kivyv version (and therefore not 3.*). The code for decode_frame is the same as on the latest 2.* version.

I cherry-picked my commit to https://github.com/audioseek/kivy/tree/2.3.0-8754-fix, which is based on 9ef2180

[misl6]

LGTM. Thank you!

[misl6]

I'd also like to backport this to 2., if you still do releases, as we are using the latest stable Kivyv version (and therefore not 3.). The code for decode_frame is the same as on the latest 2.* version.

I cherry-picked my commit to https://github.com/audioseek/kivy/tree/2.3.0-8754-fix, which is based on 9ef2180

ATM we do not have another 2.x.x release scheduled, but we may be forced to make one if the 3.x.x is not ready before the end of the year, so stay tuned.

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