fix borg.remote._resolve_path

this used to call get_base_dir (and would have needed
legacy=True now to work like expected).

rather implemented the desired behaviour locally and
got rid of the legacy call (which was a bit strange
anyway as it also considered BORG_BASE_DIR, which is
unexpected when resolving ~).

src/borg/remote.py

@@ -20,7 +20,6 @@
 from .constants import *  # NOQA
 from .helpers import Error, IntegrityError
 from .helpers import bin_to_hex
-from .helpers import get_base_dir
 from .helpers import get_limited_unpacker
 from .helpers import replace_placeholders
 from .helpers import sysinfo
@@ -255,7 +254,8 @@ def _resolve_path(self, path):
         if isinstance(path, bytes):
             path = os.fsdecode(path)
         if path.startswith("/~/"):  # /~/x = path x relative to own home dir
-            path = os.path.join(get_base_dir(), path[3:])
+            home_dir = os.environ.get("HOME") or os.path.expanduser("~%s" % os.environ.get("USER", ""))
+            path = os.path.join(home_dir, path[3:])
         elif path.startswith("/./"):  # /./x = path x relative to cwd
             path = path[3:]
         return os.path.realpath(path)