vo_opengl: fix precision loss of fruit dithering matrix

With default setting, the matrix for fruit dithering requires 12 bits
precision (values from 0/4096 to 4095/4096). But 16-bit float
provides only 10 bits. In addition, when `dither-size-fruit=8` is
set, 16 bits are required from the texture format.

Fix this by attempting to use 16 bit integer texture first. This is
still not precise, but should be better than using a half float.

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