service binding changed the default application projection to use files

Description of problem:

Recent release of service binding changed the default application projection to use files. This affects topology because we never set the value of `bindAsFiles`. Therefore prior to the latest release, it would have been `false`. But now it is `true`. This changes the default behavior because apps which expected env vars to be set, won't with the new spec.

Prerequisites (if any, like setup, operators/versions):

install service binding operator

Steps to Reproduce

1. follow the setup here https://github.com/redhat-developer/service-binding-operator/tree/master/examples/nodejs_postgresql
2. use topology to create a service binding between the app and the db
3. inspect the yaml of the service binding

Actual results:

notice `bindAsFiles: true` in the spec

Expected results:

Prior to the latest release of service binding, `bindAsFiles` would be false

Reproducibility (Always/Intermittent/Only Once):

always

Build Details:

Additional info: