Bug#30821: setting --tc_heuristic_recover tries to set myisam_stats_method

Options to mysqld were not processed correctly because switch statement
was missing some "break"s. CS adds them.

No test case; would require .opt file and server restart. Manually tested.

sql/mysqld.cc

@@ -7165,6 +7165,7 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
       have_merge_db= SHOW_OPTION_YES;
     else
       have_merge_db= SHOW_OPTION_DISABLED;
+    break;
 #ifdef HAVE_BERKELEY_DB
   case OPT_BDB_NOSYNC:
     /* Deprecated option */
@@ -7304,6 +7305,7 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
       fprintf(stderr, "Unknown option to tc-heuristic-recover: %s\n",argument);
       exit(1);
     }
+    break;
   }
   case OPT_MYISAM_STATS_METHOD:
   {