tree-wide: change initialization to use EBADF instead of EBADFD

Those fds never were, so it's not fair to say that they are in "bad state".
Let's use the shorter and more direct errno.

src/basic/env-file.c

@@ -381,7 +381,7 @@ int parse_env_file_fd_sentinel(
                 const char *fname, /* only used for logging */
                 ...) {
 
-        _cleanup_close_ int fd_ro = -EBADFD;
+        _cleanup_close_ int fd_ro = -EBADF;
         _cleanup_fclose_ FILE *f = NULL;
         va_list ap;
         int r;

src/basic/stat-util.c

@@ -183,7 +183,7 @@ static int fd_is_read_only_fs(int fd) {
 }
 
 int path_is_read_only_fs(const char *path) {
-        _cleanup_close_ int fd = -EBADFD;
+        _cleanup_close_ int fd = -EBADF;
 
         assert(path);