Revert "Fix travis setup on 18/19"

This reverts commit 05376a5d3a.

Signed-off-by: Julius Härtl <jus@bitgrid.net>

.travis.yml

@@ -20,12 +20,17 @@ before_install:
     - phpunit --version
     - wget https://raw.githubusercontent.com/nextcloud/travis_ci/master/before_install.sh
     - bash ./before_install.sh deck $CORE_BRANCH $DB
+    - cd ../server
+
+before_script:
+    - cd apps/deck
+    - composer install --no-dev
+    - cd ../../
+    - ./occ app:enable deck
+    - cd apps/deck
 
 script:
     - composer install
-    - cd ../server
-    - ./occ app:enable deck
-    - cd apps/deck
     - make test-unit
 
 after_success: