Fix "antialiased" context attribute typo

The intent in these tests was to set the context to not use antialiasing.
Fix in 1.0.2 and later, 1.0.1 doesn't have these tests.
Fix antialias setting in copy-tex-image-and-sub-image-2d.html

Previously, if the antialias flag was set, the test actually forced
antialiasing off. If antialias flag was not set, the test used the
default setting in WebGL test utils, which also is antialiasing off. Fix
this so that antialiasing is always explicitly specified in the test and
that having antialiasing on gets tested. This fix is backported to 1.0.1
and 1.0.2.

Also fix formatting of this test's output in 1.0.3+
Merge pull request #379 from NVIDIA/antialiased-typo

Fix "antialiased" context attribute typo
Merge pull request #380 from NVIDIA/copy-tex-image-antialias-fix

Fix antialias setting in copy-tex-image-and-sub-image-2d.html