gcr: Allow cancellation between ops in the GcrPromptDialog
gcr: Allow cancellation between ops in the GcrPromptDialog

 * Keep the cancel button enabled when in 'password checking' mode.

Distrotech/gcr,stefwalter/gcr,Distrotech/gcr,stefwalter/gcr,Distrotech/gcr,stefwalter/gcr,stefwalter/gcr,Distrotech/gcr