fix preProcessEvent no being registered in legacy mode

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>eu.endermite</groupId>
     <artifactId>CommandWhitelist</artifactId>
-    <version>1.7.2</version>
+    <version>1.7.3</version>
     <packaging>jar</packaging>
 
     <name>CommandWhitelist</name>

src/main/java/eu/endermite/commandwhitelist/spigot/CommandWhitelist.java

@@ -28,9 +28,10 @@ public class CommandWhitelist extends JavaPlugin {
 
         Plugin protocollib = getServer().getPluginManager().getPlugin("ProtocolLib");
 
+        getServer().getPluginManager().registerEvents(new PlayerCommandPreProcessListener(), this);
         if (!isLegacy) {
             if (!getConfigCache().isUseProtocolLib() || protocollib == null || !protocollib.isEnabled()) {
-                getServer().getPluginManager().registerEvents(new PlayerCommandPreProcessListener(), this);
+
                 getServer().getPluginManager().registerEvents(new PlayerCommandSendListener(), this);
             } else {
                 PacketCommandSendListener.protocol(this);