Fix overflow button for long lines with one token

[Exaphis]

Issue #, if available: #4817

Description of changes: Check if MAX_LINE_LENGTH is reached for the first token as well as the others.

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[Exaphis]

Saw the build failed due to renderIndentGuide being passed a token instead of value. Also noticed that value should be updated with the result of renderIndentGuide, so I refactored it to use similar logic to renderWrappedLine.

[codecov]

Codecov Report

Merging #4818 (4cae849) into master (5c35ca8) will decrease coverage by 0.00%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master    #4818      +/-   ##
==========================================
- Coverage   71.11%   71.11%   -0.01%     
==========================================
  Files         554      554              
  Lines       55716    55714       -2     
  Branches    10420    10420              
==========================================
- Hits        39624    39620       -4     
- Misses      16092    16094       +2     

Flag	Coverage Δ
unittests	71.11% <85.71%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
lib/ace/layer/text.js	90.81% <85.71%> (-0.30%)	⬇️
lib/ace/editor.js	79.66% <0.00%> (-0.08%)	⬇️

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