community/qt5-qtwebengine: set force_debug_info for chromium symbols

otherwise it is disabled at https://invent.kde.org/qt/qt/qtwebengine/-/blob/2b6f6ad066123253b65449033eddcee8b20c470b/src/buildtools/config/common.pri#L73
8 jobs for !30372 with qt5-qtwebengine-chromium-debuginfo in 8 seconds (queued for 4 seconds)
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