scripted-diff: Remove trailing whitespaces

-BEGIN VERIFY SCRIPT-

sed --in-place'' --regexp-extended 's/[[:space:]]+$//g' $(git grep -I --files-with-matches --extended-regexp '[[:space:]]+$' -- src test  ':!*.svg' ':!src/crypto/sha256_sse4*' ':!src/leveldb' ':!src/qt/locale' ':!src/secp256k1' ':!src/univalue')

-END VERIFY SCRIPT-

src/qt/trafficgraphwidget.cpp

@@ -80,7 +80,7 @@ void TrafficGraphWidget::paintEvent(QPaintEvent *)
 
     const QString units     = tr("KB/s");
     const float yMarginText = 2.0;
-    
+
     // draw lines
     painter.setPen(axisCol);
     painter.drawText(XMARGIN, YMARGIN + h - h * val / fMax-yMarginText, QString("%1 %2").arg(val).arg(units));