fix invalid xpath attr

[codeskyblue]

No description provided.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 28.35%. Comparing base (9603bce) to head (03e0573).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
uiautomator2/xpath.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1143   +/-   ##
=======================================
  Coverage   28.35%   28.35%           
=======================================
  Files          21       21           
  Lines        2906     2906           
  Branches      439      439           
=======================================
  Hits          824      824           
  Misses       2047     2047           
  Partials       35       35           

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