test: Move reindex test to standard tests

This test finishes very quickly, so it should be part of the default set
of tests in rpc-tests.

qa/pull-tester/rpc-tests.sh

@@ -33,6 +33,7 @@ testScripts=(
     'signrawtransactions.py'
     'walletbackup.py'
     'nodehandling.py'
+    'reindex.py'
 );
 testScriptsExt=(
     'bipdersig-p2p.py'
@@ -44,7 +45,6 @@ testScriptsExt=(
     'invalidateblock.py'
     'keypool.py'
     'receivedby.py'
-    'reindex.py'
     'rpcbind_test.py'
 #   'script_test.py'
     'smartfees.py'