Fix default solve algorithm handling

[ChrisRackauckas]

Fixes #7

[codecov]

Codecov Report

Merging #25 (073a9c8) into main (cdfe484) will increase coverage by 4.22%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   73.13%   77.35%   +4.22%     
==========================================
  Files           5        5              
  Lines         201      212      +11     
==========================================
+ Hits          147      164      +17     
+ Misses         54       48       -6     

Impacted Files	Coverage Δ
src/common.jl	80.55% <75.00%> (+1.14%)	⬆️
src/default.jl	26.92% <100.00%> (+26.92%)	⬆️
src/factorization.jl	94.59% <100.00%> (+1.49%)	⬆️

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