perf(routers): add placeholder to avoid loop call

[linrongbin16]

Regression Test

Platforms

• windows
• macOS
• linux

Tasks

• Use <leader>gl to copy git link.
• Use <leader>gL to open git link in browser.
• Copy git link in a symlink directory of git repo.
• Copy git link in an un-pushed git branch, and receive an expected error.
• Copy git link in a pushed git branch but edited file, and receive a warning says the git link could be wrong.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (229f3b3) 81.49% compared to head (3e6fb18) 80.25%.

Files	Patch %	Lines
lua/gitlinker/routers.lua	62.50%	6 Missing ⚠️
lua/gitlinker.lua	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #121      +/-   ##
==========================================
- Coverage   81.49%   80.25%   -1.24%     
==========================================
  Files          12       12              
  Lines         805      795      -10     
==========================================
- Hits          656      638      -18     
- Misses        149      157       +8     

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