Fix tinker tank and seared furnace no longer allowing the controller …

…in the bottom layer (#3719)

Makes sense for smelteries, but not valid for the other two

src/main/java/slimeknights/tconstruct/smeltery/multiblock/MultiblockCuboid.java

@@ -39,7 +39,7 @@ public MultiblockStructure detectMultiblock(World world, BlockPos center, int li
     center = getOuterPos(world, center, EnumFacing.DOWN, 64).up();
 
     // below lowest internal position
-    if (masterY < center.getY()) {
+    if (!hasFrame && masterY < center.getY()) {
       return null;
     }