Remove SkSLErrorTests from T CTS

These were added after the T release, so they should not be run on T
devices. Ida2c58a30c70d9a4ae0f64ec943662ba1162e406 accidentally added
them in along with other changes that were needed in T.

Bug: b/286962319
Test: atest CtsSkQPTestCases
Change-Id: Ib7fb60b89df411cbfa625ef1d9a4b1c76515bc8c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/715316
Auto-Submit: Leon Scroggins <scroggo@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>