lib: make event static properties non writable and configurable
The idl definition for Event makes the properties constants, this means that they shouldn't be configurable. However, they were, and this commit fixes that.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The idl definition for Event makes the properties constants, this means that they shouldn't be configurable. However, they were, and this commit fixes that.