[ci] Remove failing check on run-coveralls

.ci/run-coveralls.sh

@@ -3,8 +3,6 @@
 set -x
 set -o errexit -o nounset
 
-if test "x$TRAVIS_SLUG" != x"harfbuzz/harfbuzz"; then exit; fi
-
 pip install --user nose
 pip install --user cpp-coveralls
 export PATH=$HOME/.local/bin:$PATH