[WIP] Reattempt login if not logged in

[Gigahawk]

Solution to #259, a little hacky for my tastes, but I'm not familiar enough with the codebase to think of a better solution and it seems to work fine.

[codecov]

Codecov Report

Merging #260 into master will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #260      +/-   ##
==========================================
- Coverage   96.64%   96.56%   -0.08%     
==========================================
  Files          13       13              
  Lines        1191     1194       +3     
==========================================
+ Hits         1151     1153       +2     
- Misses         40       41       +1     

Impacted Files	Coverage Δ
mopidy_spotify/search.py	92.85% <100.00%> (-2.02%)	⬇️

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