option to disable initializing dialog

[rhjdvsgsgks]

Is your feature request related to a problem? Please describe.
original goldendict have a option to disable initializing dialog. but goldendict-ng removed it

Describe the solution you'd like
add the disable initializing dialog option back

Describe alternatives you've considered

Additional context

goldendict-ng/src/initializing.cc

Line 16 in 9f13188

if ( parent->isVisible() ) {