Subtask quick creation breaks when spaces available in between the property values.

Steps of replication:

1. Go to jira-application.properties.
2. Make sure jira.view.issue.show.quicksubtask.when.no.subtasks=true
3. Search for jira.subtask.quickcreateform.fields property value
4. Place the property value as the following example:

   jira.subtask.quickcreateform.fields = summary, timetracking, assignee, customfield_10030, issuetype, fixVersions=10000
   

Then try to create a subtask with the subtask quick creation form. The following error message will be display:

java.lang.NumberFormatException: For input string: "$webComponent.getSubTaskFieldPreset($fieldId)"
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Long.parseLong(Unknown Source)