fix pypi repo name in upload script

it needs to be like this to support a ~/.pypirc like this,
containing a separate upload token for the borgbackup project:

[distutils]
index-servers =
    borgbackup
    ...

[borgbackup]
repository = https://upload.pypi.org/legacy/
username = __token__
password = pypi-...(token)...

scripts/upload-pypi

@@ -8,11 +8,11 @@ if [ "$R" = "" ]; then
 fi
 
 if [ "$2" = "test" ]; then
-    export TWINE_REPOSITORY=testpypi
+    export TWINE_REPOSITORY=borgbackuptest
 else
-    export TWINE_REPOSITORY=pypi
+    export TWINE_REPOSITORY=borgbackup
 fi
 
 D=dist/borgbackup-$R.tar.gz
 
-twine upload "$D"
+twine upload $D