fix phone numner validation for ka-GE locale

[avkvak]

#1950

According https://en.wikipedia.org/wiki/Telephone_numbers_in_Georgia_(country)
Georgian phone number should consist of 12 digits started with +9955... or +99579... for mobile numbers

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)

[codecov]

Codecov Report

Merging #1952 (b415ade) into master (c1b21a9) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #1952   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          102       102           
  Lines         2085      2085           
  Branches       472       472           
=========================================
  Hits          2085      2085           

Impacted Files	Coverage Δ
src/lib/isMobilePhone.js	100.00% <ø> (ø)

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[rubiin]

Thankyou for the contribution 🎉