[pgAdmin][RM5292] Alertify header buttons focus color issue

[Nagesh Dhope]

Hi Hackers,

Please find a patch which includes

   1. Use *btn-secondary* styles for all buttons in alertify dialog header.
   2. Added *!default *for $active-border variable, so that it can be
   overridden if required.
   3. Added entry for *.scss *in .editorconfig

-- 
Thanks,
Nagesh

RM5292.patch
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