Don't yell if Floodgate cannot remove the injection

velocity/src/main/java/org/geysermc/floodgate/inject/velocity/VelocityInjector.java

@@ -75,6 +75,11 @@ public final class VelocityInjector extends CommonPlatformInjector {
         return injected = true;
     }
 
+    @Override
+    public boolean canRemoveInjection() {
+        return false;
+    }
+
     @Override
     public boolean removeInjection() {
         logger.error("Floodgate cannot remove itself from Bungee without a reboot");