SPIGOT-1862: Fix banners withj shields.

src/main/java/org/bukkit/craftbukkit/block/CraftBanner.java

@@ -96,7 +96,7 @@ public class CraftBanner extends CraftBlockState implements Banner {
 
     @Override
     public boolean update(boolean force, boolean applyPhysics) {
-        boolean result = super.update(force, applyPhysics);
+        boolean result = (isPlaced()) ? super.update(force, applyPhysics) : true;
 
         if (result) {
             banner.color = base.getDyeData();

src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBlockState.java

@@ -187,6 +187,9 @@ public class CraftMetaBlockState extends CraftMetaItem implements BlockStateMeta
 
     @Override
     public BlockState getBlockState() {
+        if (blockEntityTag != null && material == Material.SHIELD) {
+            blockEntityTag.setString("id", "Banner"); // Hack
+        }
         TileEntity te = blockEntityTag == null ? null : TileEntity.a(MinecraftServer.getServer(), blockEntityTag);
 
         switch (material) {