Simplify code.

Author: thw26

jrnl/journals/FolderJournal.py

@@ -137,15 +137,11 @@ def _get_files(self, journal_path: str) -> list[str]:
         if self.config["extension"] is not None:
             EXTENSIONSARRAYLENGTH = len (self.config["extension"])
         EXTENSIONARRAY = self.config["extension"]
-        COUNTER = 0
         if EXTENSIONSARRAYLENGTH > 0:
             EXTENSIONS = "(txt"
             for i in EXTENSIONARRAY:
-                COUNTER = COUNTER + 1
-                if COUNTER < EXTENSIONSARRAYLENGTH: 
-                    EXTENSIONS = EXTENSIONS + "|" + i
-                else:
-                    EXTENSIONS = EXTENSIONS + "|" + i + ")"
+                EXTENSIONS = EXTENSIONS + "|" + i
+            EXTENSIONS = EXTENSIONS + ")"
         else:
             EXTENSIONS = "(txt)"
         for year_folder in Folder._get_year_folders(pathlib.Path(journal_path)):