Don't describe 'more info' prompt in #glance help

When using #glance, the player is never prompted about whether she wants
'more info' about something on the map, even if flags.help is true and
she has pressed '.' -- the 'more info' prompt is exclusive to #whatis.
getpos_help already changed its description of '.' based on whether
'help' was on or off; adjust those criteria so that the description of
the 'more info' prompt is only included for #whatis, where it is
actually relevant.

I recently looked at the help while using #glance and got confused
about why the 'more info' prompt was never appearing, so hopefully this
should help forestall that sort of thing.  #glance also prompts only
once, so there's some other information about "moving to another spot"
in the help text which is not relevant -- that could definitely be
addressed as well but I think it's less likely to be confusing, so I
didn't bother with it in this commit.

src/do_name.c

@@ -221,7 +221,7 @@ getpos_help(boolean force, const char *goal)
             Sprintf(sbuf,
                     "  '%s' describe current spot,%s move to another spot;",
                     visctrl(g.Cmd.spkeys[NHKF_GETPOS_PICK]),
-                    flags.help ? " prompt if 'more info'," : "");
+                    flags.help && !force ? " prompt if 'more info'," : "");
             putstr(tmpwin, 0, sbuf);
             Sprintf(sbuf,
                     "  '%s' describe current spot, move to another spot;",