Revert "fallback code for command lookup"

This reverts commit 74a549c74bcabdb094c5c46f919ed98288631352.

By: Dinnerbone <dinnerbone@dinnerbone.com>

paper-api/src/main/java/org/bukkit/command/SimpleCommandMap.java

@@ -72,12 +72,6 @@ public final class SimpleCommandMap implements CommandMap {
 
         Command target = knownCommands.get(sentCommandLabel);
         boolean isRegisteredCommand = (target != null);
-        if (isRegisteredCommand) {
-            target.execute(sender, sentCommandLabel, args);
-            return true;
-        }
-        target = knownCommands.get(sentCommandLabel.substring(1));
-        isRegisteredCommand = (target != null);
         if (isRegisteredCommand) {
             target.execute(sender, sentCommandLabel, args);
         }