[recipes] Fix internal_test tryjobs.

>>> 'internal_test.git'.rstrip('.git')
'internal_tes'

Change-Id: If023784a7387a89b2ba1972ea43d68a0c07df635
Reviewed-on: https://skia-review.googlesource.com/19546
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
1 file changed