Keep the Perl version of 'mysql-test-run' in sync with the shell script.

mysql-test/lib/mtr_report.pl:
  Keep the Perl version in sync with the shell script so that 'Do-compile' will call
  PS and ES tests even after some previous test failures.
  (See previous change to 'mysql-test-run.sh' and 'Do-compile'.)

mysql-test/lib/mtr_report.pl

@@ -161,7 +161,7 @@ sub mtr_report_stats ($) {
   {
     my $ratio=  $tot_passed * 100 / $tot_tests;
     printf "Failed $tot_failed/$tot_tests tests, " .
-      "%.2f\% successful.\n\n", $ratio;
+      "%.2f\% were successful.\n\n", $ratio;
     print
       "The log files in var/log may give you some hint\n",
       "of what when wrong.\n",