Scripts/Commands: Make the .modify reputation command only modify the specified reputation (ignore spillovers)

Patch by @ogeraisi

src/server/scripts/Commands/cs_modify.cpp

@@ -1234,7 +1234,7 @@ public:
             return false;
         }
 
-        target->GetReputationMgr().SetReputation(factionEntry, amount);
+        target->GetReputationMgr().SetOneFactionReputation(factionEntry, amount);
         handler->PSendSysMessage(LANG_COMMAND_MODIFY_REP, factionEntry->name[handler->GetSessionDbcLocale()], factionId,
             handler->GetNameLink(target).c_str(), target->GetReputationMgr().GetReputation(factionEntry));
         return true;