Fixes Pretty.__measure__ not respecting expand_all

[willmcgugan]

Fixes #1998

[codecov-commenter]

Codecov Report

Merging #2002 (3b1518f) into master (e839bfb) will decrease coverage by 0.01%.
The diff coverage is 99.09%.

@@            Coverage Diff             @@
##           master    #2002      +/-   ##
==========================================
- Coverage   99.82%   99.81%   -0.02%     
==========================================
  Files          71       71              
  Lines        6943     7043     +100     
==========================================
+ Hits         6931     7030      +99     
- Misses         12       13       +1     

Flag	Coverage Δ
unittests	99.81% <99.09%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
rich/default_styles.py	100.00% <ø> (ø)
rich/highlighter.py	100.00% <ø> (ø)
rich/markdown.py	100.00% <ø> (ø)
rich/syntax.py	99.27% <97.72%> (-0.34%)	⬇️
rich/pretty.py	99.71% <98.88%> (-0.29%)	⬇️
rich/__main__.py	100.00% <100.00%> (ø)
rich/_inspect.py	100.00% <100.00%> (ø)
rich/color.py	100.00% <100.00%> (ø)
rich/console.py	100.00% <100.00%> (ø)
rich/filesize.py	100.00% <100.00%> (ø)
... and 6 more

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