Common.lua: surface playerClass in CoaExporterCatalog._meta

Diagnostic so we can tell whether the patched scan actually ran
(if _meta.playerClass is non-Unknown, /reload picked up the new file)
without having to inspect the chat log.

CoaExporter/Catalogs/Common.lua

@@ -222,6 +222,8 @@ function C.Run(filter, callback)
                 lastScanAt = ctx.startedAt,
                 filter = ctx.filter,
                 totalEntries = total,
+                playerClass = ctx.playerClass,
+                playerClassFile = ctx.playerClassFile,
             }
             log(string.format("done. %d entries processed; /reload to flush SavedVariables.", total))
             if callback then callback(ctx) end