bug(lsp): fixes relative path resolution in fortls

[gnikit]

Fixes #693

[codecov]

Codecov Report

Merging #694 (586a08c) into main (0a64841) will increase coverage by 1.02%.
The diff coverage is 95.74%.

❗ Current head 586a08c differs from pull request most recent head 7117630. Consider uploading reports for the commit 7117630 to get more accurate results

@@            Coverage Diff             @@
##             main     #694      +/-   ##
==========================================
+ Coverage   82.35%   83.37%   +1.02%     
==========================================
  Files          12       12              
  Lines        2227     2262      +35     
  Branches      199      202       +3     
==========================================
+ Hits         1834     1886      +52     
+ Misses        386      371      -15     
+ Partials        7        5       -2     

Impacted Files	Coverage Δ
src/lsp/client.ts	66.75% <95.74%> (+4.31%)	⬆️
src/features/linter-provider.ts	81.45% <0.00%> (+2.09%)	⬆️

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