Fix assert_screen_change method call

[rwx788]

See poo#50093.

[rwx788]

@foursixnine, could you please take a look?

[codecov]

Codecov Report

Merging #1142 into master will decrease coverage by 12.72%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           master    #1142       +/-   ##
===========================================
- Coverage   40.21%   27.48%   -12.73%     
===========================================
  Files          40       40               
  Lines        4812     4813        +1     
  Branches      811      811               
===========================================
- Hits         1935     1323      -612     
- Misses       2549     3277      +728     
+ Partials      328      213      -115

Impacted Files	Coverage Δ
testapi.pm	5.26% <0%> (-0.01%)	⬇️
OpenQA/Benchmark/Stopwatch.pm	5% <0%> (-63.34%)	⬇️
consoles/network_console.pm	36.36% <0%> (-54.55%)	⬇️
consoles/VNC.pm	3.88% <0%> (-40.39%)	⬇️
ppmclibs/blib/lib/tinycv.pm	7.52% <0%> (-39.79%)	⬇️
backend/baseclass.pm	23.12% <0%> (-35.67%)	⬇️
consoles/vnc_base.pm	8.33% <0%> (-34.38%)	⬇️
consoles/console.pm	27.5% <0%> (-27.5%)	⬇️
consoles/sshIucvconn.pm	22.72% <0%> (-18.19%)	⬇️
needle.pm	38.03% <0%> (-15.96%)	⬇️
... and 4 more

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