bug(linux): X11-024___options_with_save_and_preset__surrounding-text test seems unstable

[mcdurdin]

https://build.palaso.org/buildConfiguration/Keyman_Linux_Test_Integration/610616?buildTab=log&linesState=90&logView=flowAware&expandAll=true&focusLine=2032

10:25:21       # Starting tests...
10:25:21       ** Message: 05:25:21.676: keyman_put_keyboard_options_todconf: saving keyboard option to DConf for k_024___options_with_save_and_preset/k_024___options_with_save_and_preset: foo=1
10:25:21       **
10:25:21       ERROR:../../../ibus-keyman/tests/testfixture.cpp:208:void test_source(IBusKeymanTestsFixture*, gconstpointer): assertion failed (options[i] == expected): ("foo=1" == "foo=0")
10:25:21       
10:25:21       (test program exited with status code 1)

...
Summary of Failures:

28/218 X11-024___options_with_save_and_preset__surrounding-text           ERROR            0.31s   exit status 1

Ok:                 209 
Expected Fail:      0   
Fail:               1   
Unexpected Pass:    0   
Skipped:            8   
Timeout:            0   

See also
https://build.palaso.org/buildConfiguration/Keyman_Linux_Test_Integration/610520?buildTab=log