Fixed Bee Box bias edge case

Fixes #386
xJon/Hexxit-II#200
Fix taken from ACGaming/Growthcraft-1.12@8c9a2b6

src/main/java/growthcraft/bees/common/tileentity/device/DeviceBeeBox.java

@@ -194,7 +194,7 @@ public void updateTick() {
                 // if the biasSpawn isn't invalid
                 if (biasSpawn > 0) {
                     // the higher the bias, the less likely the operation will flip
-                    if (random.nextInt(biasSpawn) == 0) {
+                    if (random.nextInt(biasSpawn + 1) == 0) {
                         // flip the operation
                         shouldFill = !shouldFill;
                     }