Remove false claim of dirname parameter from Folder::remove doc comment

Previously the documentation comment claimed the function had a `dirname` parameter even though the function does not have any parameters.

Author: per1234

src/Folder.h

@@ -52,7 +52,6 @@ class Folder {
 
     /**
      * @brief Removes a directory.
-     * @param dirname The name of the directory to remove.
      * @return True if the directory was removed successfully, false otherwise.
      */
     bool remove();
@@ -168,4 +167,4 @@ class Folder {
     std::string path;
 };
 
-#endif
+#endif