Qt5 use base color for workspace too

This was uncovered by the fix for tdf#136555. The current color
for the start center button bar is too dark.

Regressed-by: a927e0964ba0442d53fffb22c577e54bcf183ed7
Change-Id: I36356117f03255cfbf1fa24a6391cb81cf1883db
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/104578
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>
diff --git a/vcl/qt5/Qt5Frame.cxx b/vcl/qt5/Qt5Frame.cxx
index cdb7c8b..b3ae786e9 100644
--- a/vcl/qt5/Qt5Frame.cxx
+++ b/vcl/qt5/Qt5Frame.cxx
@@ -1023,7 +1023,6 @@ void Qt5Frame::UpdateSettings(AllSettings& rSettings)
    Color aText = toColor(pal.color(QPalette::Active, QPalette::Text));
    Color aBase = toColor(pal.color(QPalette::Active, QPalette::Base));
    Color aButn = toColor(pal.color(QPalette::Active, QPalette::ButtonText));
    Color aMid = toColor(pal.color(QPalette::Active, QPalette::Mid));
    Color aHigh = toColor(pal.color(QPalette::Active, QPalette::Highlight));
    Color aHighText = toColor(pal.color(QPalette::Active, QPalette::HighlightedText));
    Color aLink = toColor(pal.color(QPalette::Active, QPalette::Link));
@@ -1047,6 +1046,7 @@ void Qt5Frame::UpdateSettings(AllSettings& rSettings)
    style.SetFieldColor(aBase);
    style.SetWindowColor(aBase);
    style.SetActiveTabColor(aBase);
    style.SetWorkspaceColor(aBase);
    style.SetAlternatingRowColor(toColor(pal.color(QPalette::Active, QPalette::AlternateBase)));

    // Buttons
@@ -1078,9 +1078,6 @@ void Qt5Frame::UpdateSettings(AllSettings& rSettings)
    style.BatchSetBackgrounds(aBack);
    style.SetInactiveTabColor(aBack);

    // Workspace
    style.SetWorkspaceColor(aMid);

    // Selection
    style.SetHighlightColor(aHigh);
    style.SetHighlightTextColor(aHighText);