Fix glowing mushrooms appearing in flowing water

Glowing Mycelium randomly spawns Glowing Mushrooms on top, but did not
check whether the Glowing Mushroom can actually survive there. So it
would spawn a lot of mushrooms inside of flowing water, which would
immediately break the mushrooms and therefore creating really fast
Glowing Mushroom farms.

src/main/kotlin/at/martinthedragon/nucleartech/blocks/GlowingMycelium.kt

@@ -30,7 +30,8 @@ class GlowingMycelium(properties: Properties) : DeadGrass(properties) {
                 }
             }
 
-        if (random.nextInt(10) == 0) { // add new mushrooms
+        // add new mushrooms
+        if (world.isEmptyBlock(pos.above()) && random.nextInt(10) == 0 && ModBlocks.glowingMushroom.get().defaultBlockState().canSurvive(world, pos.above())) {
             var count = 0
             for (i in -5..4) {
                 for (j in -5..5) {