Fix NMS version not doing checks against current instance but rather with the current NMS version of the server.

Author: TechnicallyCoded

src/main/java/com/nuclyon/technicallycoded/inventoryrollback/nms/EnumNmsVersion.java

@@ -1,7 +1,5 @@
 package com.nuclyon.technicallycoded.inventoryrollback.nms;
 
-import com.nuclyon.technicallycoded.inventoryrollback.InventoryRollbackPlus;
-
 public enum EnumNmsVersion {
     v1_8_R1,
     v1_8_R2,
@@ -21,11 +19,11 @@ public enum EnumNmsVersion {
     v1_17_R1;
 
     public boolean isAtLeast(EnumNmsVersion version) {
-        return InventoryRollbackPlus.getInstance().getVersion().ordinal() >= version.ordinal();
+        return this.ordinal() >= version.ordinal();
     }
 
     public boolean isNoHigherThan(EnumNmsVersion version) {
-        return InventoryRollbackPlus.getInstance().getVersion().ordinal() <= version.ordinal();
+        return this.ordinal() <= version.ordinal();
     }
 
     public boolean isWithin(EnumNmsVersion versionLow, EnumNmsVersion versionHigh) {