Simplified CORS Dispatcher configuration

[davidjgonzalez]

Simplified CORS configuration by removing ENABLE_CORS variable. The enabling of CORS in Dispatcher is implicit via the addition of the CORS section in the vhost.

Motivation and Context

Simplify the CORS Dispatcher configuration.

How Has This Been Tested?

AEM SDK Dispatcher Tools validator, and RDE.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.