ada_val_print_1: Go through val_print instead of recursive call to self.

ada_val_print_1: Go through val_print instead of recursive call to self.

This is to standardize a little bit how printing is done, and in
particular make sure that everyone goes through val_print when
printing sub-objects.  This helps making sure that standard features
handled by val_print get activated when expected.

gdb/ChangeLog:

        * ada-valprint.c (ada_val_print_1): Replace calls to
        ada_val_print_1 by calls to val_print.