Travis: only enable transifex job on main repo

To avoid false positive alarm from citra-nightly and citra-canary repo

.travis.yml

@@ -26,7 +26,7 @@ matrix:
       script: "./.travis/linux/build.sh"
       after_success: "./.travis/linux/upload.sh"
       cache: ccache
-    - if: branch = master AND type = push
+    - if: repo = citra-emu/citra AND branch = master AND type = push
       os: linux
       env: NAME="transifex push"
       sudo: required