Fixed typo in LinearSolvers.jl

[oriolcg]

Hi @fverdugo @amartinhuertas,

I found a typo in LinearSolvers.jl when trying to update GridapODEs. Apparently the function solve! in line

Gridap.jl/src/Algebra/LinearSolvers.jl

Line 187 in 2015bd1

function solve!(x::AbstractVector,

was not stressed by any Gridap test. I added the corresponding test in LinearSolversTests.jl

[codecov-commenter]

Codecov Report

Merging #692 (1faacc4) into master (2015bd1) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #692      +/-   ##
==========================================
+ Coverage   87.94%   88.06%   +0.12%     
==========================================
  Files         133      133              
  Lines       14968    14970       +2     
==========================================
+ Hits        13163    13184      +21     
+ Misses       1805     1786      -19     

Impacted Files	Coverage Δ
src/Algebra/LinearSolvers.jl	92.98% <100.00%> (+17.08%)	⬆️

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