Fix JS syntax error in variable declaration

Declarations in javascript should end with a semicolon. This
otherwise causes strange and hard to debug issues in minified
js assets.

Change-Id: I821a71b169b86e9f0318cbae4c6cc654cb97a4a7
(cherry picked from commit 052ff09bff)

sahara_dashboard/content/data_processing/static/dashboard/project/data_processing/js/data_processing.job_launching.js

@@ -18,4 +18,4 @@ horizon.job_launching_warning = {
         }
     }
 
-}
+};