Display pattern for file association when showing referenced grammar code lens

[datho7561]

When you associate a grammar with a schema using the file association pattern method, the code lens at the top of the file displays "(with file association)":

When using other grammar binding strategies (schemaLocation, xml-model, external DTD...), the code lens displays the name of the referenced schema.

In order to make this more helpful and similar to the other binding strategies, add the pattern for the file association to the beginning of this code lens