cmd: always call setproctitle

[SandyXSD]

We have to always call the gspt.SetProcTitle to adjust the title, or it will be reset to args[0] after the gspt package initialized.
See: https://github.com/erikdubbelboer/gspt/blob/ce36a5128377/gspt.go#L55

[codecov-commenter]

Codecov Report

Merging #1361 (66602dd) into main (5c6d557) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1361      +/-   ##
==========================================
+ Coverage   59.41%   59.61%   +0.19%     
==========================================
  Files         128      128              
  Lines       21663    21670       +7     
==========================================
+ Hits        12872    12918      +46     
+ Misses       7254     7205      -49     
- Partials     1537     1547      +10     

Impacted Files	Coverage Δ
cmd/main.go	56.12% <100.00%> (+0.51%)	⬆️
cmd/bench.go	78.78% <0.00%> (-1.35%)	⬇️
pkg/meta/tkv.go	75.44% <0.00%> (-0.75%)	⬇️
pkg/chunk/disk_cache.go	80.29% <0.00%> (+1.47%)	⬆️
pkg/chunk/cached_store.go	73.18% <0.00%> (+2.42%)	⬆️
cmd/mount_unix.go	54.23% <0.00%> (+6.77%)	⬆️
cmd/gc.go	64.76% <0.00%> (+15.84%)	⬆️

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