fix(isMobilePhone): fixed es-CU matching all numbers that start with 5 longer than 8 digits

[klaframboise]

fixes #2196

This MR fixes the es-CU locale isMobilePhone regex by adding the missing end of line matcher.

Checklist

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

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (43803c0) 100.00% compared to head (0871157) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2197   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          106       106           
  Lines         2348      2348           
  Branches       593       593           
=========================================
  Hits          2348      2348           

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

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[profnandaa]

LGTM, thanks for the fix!