tests: make all test files executable

For consistency with the rest of the test files.

Signed-off-by: Mark Rada <marada@uwaterloo.ca>
Signed-off-by: Jeff King <peff@peff.net>
diff --git a/t/t5531-deep-submodule-push.sh b/t/t5531-deep-submodule-push.sh
old mode 100644
new mode 100755
diff --git a/t/t9501-gitweb-standalone-http-status.sh b/t/t9501-gitweb-standalone-http-status.sh
old mode 100644
new mode 100755