Silly mistake fixed

Author: sam-kirby

src/main/java/org/dimdev/jeid/mixin/modsupport/biometweaker/MixinBiomeHelper.java

@@ -14,6 +14,6 @@ private static int getMaxBiomeId(int oldValue) {
 
     @ModifyConstant(method = "getNextFreeBiomeId", constant = @Constant(intValue = 0x100), remap = false)
     private static int getLoopUpperLimit(int oldValue) {
-        return 0xEFFFFFFF;
+        return 0x7FFFFFFF;
     }
 }