JavaImport: Convert Java specific notation '...' into a language independent array definition

In JavaImport::fillSource(), replace method vararg notation "..."
occurring in the input word by "[]".

BUG:401290
FIXED-IN:2.26.90 (KDE Applications 18.11.90)
Reviewed By: habacker
Differential Revision: https://phabricator.kde.org/D17108