Cleanup: remove redundant path functions

- BLI_path_normalize ran BLI_path_abs on a path that had already
  been made absolute.
- BLI_path_slash_ensure was called after BLI_path_normalize_dir
  which already ensures a slash.

source/blender/blenkernel/intern/lib_id.c

@@ -137,7 +137,7 @@ static bool lib_id_library_local_paths_callback(BPathForeachPathData *bpath_data
     /* Path was relative and is now absolute. Remap.
      * Important BLI_path_normalize runs before the path is made relative
      * because it won't work for paths that start with "//../" */
-    BLI_path_normalize(base_new, filepath);
+    BLI_path_normalize(NULL, filepath);
     BLI_path_rel(filepath, base_new);
     BLI_strncpy(r_path_dst, filepath, FILE_MAX);
     return true;

source/blender/editors/space_file/file_ops.c

@@ -199,7 +199,6 @@ static FileSelect file_select_do(bContext *C, int selected_idx, bool do_diropen)
         else if (file->redirection_path) {
           BLI_strncpy(params->dir, file->redirection_path, sizeof(params->dir));
           BLI_path_normalize_dir(BKE_main_blendfile_path(bmain), params->dir, sizeof(params->dir));
-          BLI_path_slash_ensure(params->dir, sizeof(params->dir));
         }
         else {
           BLI_path_normalize_dir(BKE_main_blendfile_path(bmain), params->dir, sizeof(params->dir));