Fix syntax in compose template

templates/docker-compose.yml.twig

@@ -214,11 +214,11 @@ services:
       - /dev/shm:/dev/shm
     privileged: true
     environment:
-      - SELENIUM_HUB_HOST: 'hub'
-      - SELENIUM_HUB_PORT: '4444'
-      - GRID: 'true'
-      - CHROME: 'false'
-      - FIREFOX: 'false'
+      SELENIUM_HUB_HOST: 'hub'
+      SELENIUM_HUB_PORT: '4444'
+      GRID: 'true'
+      CHROME: 'false'
+      FIREFOX: 'false'
     depends_on:
       - php
 
@@ -230,16 +230,16 @@ services:
       - /dev/shm:/dev/shm
     privileged: true
     environment:
-      - NOVNC: 'true'
-      - SELENIUM_HUB_HOST: 'hub'
-      - SELENIUM_HUB_PORT: '4444'
-      - SELENIUM_NODE_HOST: '{{ docker0.ip }}'
-      - SCREEN_WIDTH: '1300'
-      - SCREEN_HEIGHT: '999'
-      - VIDEO: 'false'
-      - GRID: 'false'
-      - CHROME: 'true'
-      - FIREFOX: 'false'
+      NOVNC: 'true'
+      SELENIUM_HUB_HOST: 'hub'
+      SELENIUM_HUB_PORT: '4444'
+      SELENIUM_NODE_HOST: '{{ docker0.ip }}'
+      SCREEN_WIDTH: '1300'
+      SCREEN_HEIGHT: '999'
+      VIDEO: 'false'
+      GRID: 'false'
+      CHROME: 'true'
+      FIREFOX: 'false'
     #ports:
       # VNC: See what's going on by connecting your VNC client to 0.0.0.0:5900
       #- 5900:25900