Fix margin between icon and repo name on dashboard

[CirnoT]

Before:

After:

The same margin (2px) is applied on Organizations tab as mr-2 but on icon itself; I haven't figured out how to apply it on Repository tab due to usage of dynamic Vue components there.

[codecov-io]

Codecov Report

Merging #13876 (f6859ba) into master (f74a094) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #13876      +/-   ##
==========================================
- Coverage   42.27%   42.24%   -0.04%     
==========================================
  Files         708      708              
  Lines       77190    77190              
==========================================
- Hits        32632    32608      -24     
- Misses      39200    39212      +12     
- Partials     5358     5370      +12     

Impacted Files	Coverage Δ
models/repo_mirror.go	2.38% <0.00%> (-11.91%)	⬇️
modules/cron/tasks_basic.go	87.35% <0.00%> (-3.45%)	⬇️
modules/notification/ui/ui.go	93.05% <0.00%> (-2.78%)	⬇️
services/pull/check.go	48.90% <0.00%> (-2.19%)	⬇️
services/mirror/mirror.go	15.78% <0.00%> (-1.11%)	⬇️
models/notification.go	66.25% <0.00%> (-0.99%)	⬇️
models/error.go	38.17% <0.00%> (-0.82%)	⬇️
models/gpg_key.go	53.33% <0.00%> (-0.58%)	⬇️
services/pull/pull.go	40.68% <0.00%> (-0.50%)	⬇️
modules/notification/mail/mail.go	39.08% <0.00%> (ø)
... and 2 more

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[silverwind]

Actually #13860 already includes a (better) fix for this if you want to check it out. Sorry for not separating it out onto its own PR.