CI: Remove non-functional attempt to set build timezone

And also trigger a build for testing

.travis.yml

@@ -15,7 +15,6 @@ jobs:
     - stage: build-prerelease
       script:
         - ./bin/travis-pre-build.sh
-        - export TZ=GMT
         - export TW5_BUILD_TIDDLYWIKI='./tiddlywiki.js'
         - export TW5_BUILD_VERSION=$(./bin/get-plugin-library-version-number)
         - export TW5_BUILD_DETAILS="Prerelease built from branch '$TRAVIS_BRANCH' at commit $(git rev-parse HEAD) of $(git remote get-url origin) at $(date +'%F %T %Z')"
@@ -26,7 +25,6 @@ jobs:
     - stage: build-tiddlywiki-com
       script:
         - ./bin/travis-pre-build.sh
-        - export TZ=GMT
         - export TW5_BUILD_TIDDLYWIKI='./node_modules/tiddlywiki/tiddlywiki.js'
         - export TW5_BUILD_VERSION=$(./bin/get-plugin-library-version-number)
         - export TW5_BUILD_DETAILS="Built from branch '$TRAVIS_BRANCH' at commit $(git rev-parse HEAD) of $(git remote get-url origin) at $(date +'%F %T %Z')"