Fix test improperly comparing measurement values

[albi3ro]

A test was comparing equality of measurment values using ==, even though that returns another measurement value instead of boolean. Now that measruement values are intrinsically truthy and instead raise an error when used as a boolean, this test is raising an error.

This change fixes it to use qml.equal and qml.assert_equal instead of bool(m1 == m2).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2e02d73) to head (df8a35b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #591   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          867       867           
=========================================
  Hits           867       867           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.