Fix restore bugs

[richfitz]

• could not specify the source properly for restore
• restore checked the wrong set for candidate volumes

Also removed the restore section from the client configuration as it was proving redundant - we allow restoring anywhere now, which feels more sensible.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9989587) 100.00% compared to head (e6c72a8) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #4   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines         1484      1520   +36     
  Branches       176       177    +1     
=========================================
+ Hits          1484      1520   +36     

Files	Coverage Δ
src/privateer2/config.py	100.00% <100.00%> (ø)
src/privateer2/restore.py	100.00% <100.00%> (ø)
src/privateer2/service.py	100.00% <100.00%> (ø)
src/privateer2/vault.py	100.00% <100.00%> (ø)
tests/test_config.py	100.00% <ø> (ø)
tests/test_restore.py	100.00% <100.00%> (ø)

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