Improve TAP tests by replacing ok() with better Test::More functions

Transpose the changes made by commit fabb33b35 in 002_pg_dump.pl
into its recently-created clone 006_pg_dump_compress.pl.

src/bin/pg_dump/t/006_pg_dump_compress.pl

@@ -612,7 +612,8 @@ foreach my $run (sort keys %pgdump_runs)
 		if (($tests{$test}->{like}->{$test_key} || $tests{$test}->{all_runs})
 			&& !defined($tests{$test}->{unlike}->{$test_key}))
 		{
-			if (!ok($output_file =~ $tests{$test}->{regexp},
+			if (!like(
+					$output_file, $tests{$test}->{regexp},
 					"$run: should dump $test"))
 			{
 				diag("Review $run results in $tempdir");
@@ -620,7 +621,8 @@ foreach my $run (sort keys %pgdump_runs)
 		}
 		else
 		{
-			if (!ok($output_file !~ $tests{$test}->{regexp},
+			if (!unlike(
+					$output_file, $tests{$test}->{regexp},
 					"$run: should not dump $test"))
 			{
 				diag("Review $run results in $tempdir");