Because values might be the result of calculations that require some
accuracy, writing the float values with the default formatting may
not be sufficient to replay correctly, therefore format the values
so that they carry more digits.

In addition, enable the test that are now passing.

Bug: angleproject:5846
Bug: angleproject:5847
Change-Id: I305552a1ffa3cded6326df59883912e14c95f5f5
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2822257
Commit-Queue: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>