Prevent exception while running BorgVersionJob with unexpected lines on stderr

The borg job logic expects the `profile_name` key to be unconditionally present in the params if any data is received on stderr. This causes the BorgVersionJob (which didn’t set this param) to fail if any unexpected output – such as LD_PRELOAD warnings – in generated while running `borg --version`. This in turn causes Vorta to silently (other than an unrelated looking exception in the console output) fall back to assuming borg 1.1.0 as the borg version.

src/vorta/borg/version.py

@@ -22,6 +22,7 @@ class BorgVersionJob(BorgJob):
             return ret
 
         ret['cmd'] = ['borg', '--version']
+        ret['profile_name'] = 'default'
         ret['ok'] = True
         return ret