Ensure grass rendering respects air block checks and update project Java home in gradle properties.

src/main/kotlin/mods/betterfoliage/client/render/RenderGrass.kt

@@ -102,6 +102,10 @@ class RenderGrass : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
         }
 
         if (!Config.shortGrass.grassEnabled) return true
+
+        val stateAbove = ctx.blockState(up1)
+        if (!stateAbove.block.isAir(stateAbove, ctx.world!!, ctx.pos.up())) return true
+
         if (isSnowed && !Config.shortGrass.snowEnabled) return true
         if (ctx.blockState(up1).isOpaqueCube) return true
         if (Config.shortGrass.population < 64 && noise[ctx.pos] >= Config.shortGrass.population) return true