Fix: wrong token type in Erlang format specifiers

[mkslanc]

Issue #, if available: #4290

Description of changes:
Before:

After:

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Pull Request Checklist:

• No backwards incompatible changes were made to Ace's public interface which is defined through the main typings file (ace.d.ts) and its references:
  • https://github.com/ajaxorg/ace/blob/master/ace.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-modes.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-extensions.d.ts

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.64%. Comparing base (7869158) to head (dbba29e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5535   +/-   ##
=======================================
  Coverage   86.64%   86.64%           
=======================================
  Files         593      593           
  Lines       42839    42839           
  Branches     7120     7120           
=======================================
  Hits        37117    37117           
  Misses       5722     5722           

Flag	Coverage Δ
unittests	86.64% <ø> (ø)

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