Don't prune program spaces when doing "maintenance info program-spaces"

Don't prune program spaces when doing "maintenance info program-spaces"

Remove the pruning of program spaces in print_program_space to remove
unwanted side-effects. "info" commands and print routines should
generally not change the state of the debugger.

gdb/Changelog:

	* progspace.c (print_program_space): Don't prune program spaces
	before printing them.