Fix out-of-box in Fminbox.

[pkofod]

Only evaluate the barrier term (to terminate linesearches etc) if out of box. #861

[codecov]

Codecov Report

Merging #862 into master will increase coverage by 0.27%.
The diff coverage is 80.76%.

@@            Coverage Diff             @@
##           master     #862      +/-   ##
==========================================
+ Coverage   81.87%   82.14%   +0.27%     
==========================================
  Files          43       43              
  Lines        2764     2778      +14     
==========================================
+ Hits         2263     2282      +19     
+ Misses        501      496       -5     

Impacted Files	Coverage Δ
src/multivariate/solvers/constrained/fminbox.jl	74.37% <80.76%> (+0.31%)	⬆️
src/utilities/perform_linesearch.jl	81.25% <0.00%> (+25.00%)	⬆️

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