Fix SearchValues fixer introducing slight changes for edge case inputs

[MihaZupan]

Fixed an edge-case code fixer issue where we would replace

new[] { (byte)'ÿ', (byte)'a', (byte)'e', (byte)'i', (byte)'o', (byte)'u' }

with

"ÿaeiou"u8

which is different ("ÿ"u8 being two bytes).

I'm not sure this is a meaningful case anyone would actually hit, but we should still avoid changing the behavior in an unobvious way.

[codecov]

Codecov Report

Merging #6926 (6df56d8) into main (8011355) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #6926      +/-   ##
==========================================
- Coverage   96.40%   96.39%   -0.01%     
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  Files        1402     1402              
  Lines      331964   332004      +40     
  Branches    11036    11039       +3     
==========================================
+ Hits       320016   320047      +31     
- Misses       9185     9193       +8     
- Partials     2763     2764       +1     

[buyaa-n]

I'm not sure this is a meaningful case anyone would actually hit, but we should still avoid changing the behavior in an unobvious way.

Sounds like we don't want to port it into 8.0