fix formatting on the borgbackup#9255 mount warning

Author: MartinKurtz

src/borg/fuse.py

@@ -567,8 +567,8 @@ def pop_option(options, key, present, not_present, wanted_type, int_base=0):
         llfuse.init(self, mountpoint, options)
         logger.warning(
             "Warning: The mounted archive is capable of containing symlinks that point outside the archive tree.\
-            When following such symlinks you may see files and directories within the mountpoint\
-            that do not reflect the archive content."
+When following such symlinks you may see files and directories within the mountpoint\
+that do not reflect the archive content."
         )
         if not foreground:
             if isinstance(self.repository_uncached, RemoteRepository):