Remove TYPE_CODE_INT case from f_value_print_inner

I looked through the various language value-print functions, to see if
any code could be consolidated.  Pretty much all I found was that
f_value_print_inner does not need to handle TYPE_CODE_INT itself, but
can simply dispatch to the generic printer.

gdb/ChangeLog
2020-09-15  Tom Tromey  <tom@tromey.com>

	* f-valprint.c (f_value_print_inner) <case TYPE_CODE_INT>:
	Remove.