Description of problem:
Cloudforms does not save default values for text boxes in the service dialog designer.

Version-Release number of selected component (if applicable):
CFME 5.6.2.1.20160922130607_92d5b5e
Firefox 45.4.0 

Steps to Reproduce:
1. Login to Cloudforms 
2. Create a new service dialog
3. Add a tab and box to the dialog
4. Add a textbox element to the box
5. Specify a default value for the textbox, and select the following attributes:
   a. Value Type: String
   b. Read-only: True (checked)
6. Select 'Save'
7. Select the new dialog in the 'Service Dialogs' accordion
8. Select 'Configuration' -> 'Edit this Dialog'
9. Select the text box created in 4-6.

Actual results:
The default value for the text box has been deleted

Expected results:
Cloudforms saves the default value for the text-box


Additional info:
A temporary work-around is to use a dynamic dialog, and set the value of the textbox from the Cloudforms Automate method:

eg; $evm.object['value'] = "Default value for the textbox"