SPIGOT-7372, SPIGOT-7373: Signs can't be edited, issues with SignChangeEvent

By: md_5 <git@md-5.net>

paper-server/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java

@@ -109,7 +109,7 @@ public class CraftSign<T extends TileEntitySign> extends CraftBlockEntityState<T
 
         for (int i = 0; i < 4; i++) {
             if (i < lines.length && lines[i] != null) {
-                components[i] = CraftChatMessage.fromString(lines[i])[0];
+                components[i] = IChatBaseComponent.literal("").append(CraftChatMessage.fromString(lines[i])[0]); // SPIGOT-7372: Vanilla wants a literal first
             } else {
                 components[i] = IChatBaseComponent.empty();
             }