emacs: sanitize dedicated widget action/notify functions

emacs: sanitize dedicated widget action/notify functions

These functions are used as action/notify functions.  That dictates
the appropriate function signatures but even though these functions
are not used for anything else they use incompatible signatures,
forcing the callers to use lambda expressions to deal with these
incompatibilities.

Fix that by adjusting the function signatures to the needs of the
only intended callers.

Two of these functions were defined as commands but because the
interactive form did not return the mandatory arguments, we know
that nobody (successfully) used these as commands.

In one case we move the location of a y-or-n-p prompt.