Only mark non-signs as stale (#14)

Fixes issue where signs in unloaded chunks were incorrectly marked as stale and deleted.

Author: Temmie3754

realty-paper-api/src/main/java/io/github/md5sha256/realty/api/SignTextApplicator.java

@@ -187,7 +187,7 @@ public void loadAndApplyChunkSigns(@NotNull World world,
                     for (SignWithRegion swr : resolved) {
                         if (applySignTextIfLoaded(world, swr.signEntity().blockX(),
                                 swr.signEntity().blockY(), swr.signEntity().blockZ(),
-                                swr.regionId(), swr.state(), swr.placeholders()) == ApplyResult.BLOCK_NOT_LOADED) {
+                                swr.regionId(), swr.state(), swr.placeholders()) == ApplyResult.FAILED) {
                             stale.add(swr.signEntity());
                         }
                     }
@@ -208,6 +208,8 @@ public void cleanupStaleSigns(@NotNull List<RealtySignEntity> stale) {
                 session.realtySignMapper().deleteByPosition(
                         signEntity.worldId(), signEntity.blockX(),
                         signEntity.blockY(), signEntity.blockZ());
+                signCache.remove(signEntity.worldId(), signEntity.blockX(),
+                        signEntity.blockY(), signEntity.blockZ());
             }
         }
         logger.info("Cleaned up " + stale.size() + " stale sign(s)");