gdb/testsuite: resolve remaining duplicate tests in gdb.guile/

gdb/testsuite: resolve remaining duplicate tests in gdb.guile/

The remaining duplicates are resolved by adding a with_test_prefix and
reindenting a proc.  I also added a couple of additional test names to
some of the tests.

gdb/testsuite/ChangeLog:

	* gdb.guile/scm-pretty-print.exp (run_lang_tests): Give some tests
	unique names, also wrap proc body in with_test_prefix.