Fix incorrect spacing sequence

\% is not a valid C escape character, we just want % here

part/annotationactionhandler.cpp

@@ -248,7 +248,7 @@ void AnnotationActionHandlerPrivate::parseTool(int toolId)
     // if the opacity value is not a default one, insert a new action in the opacity list
     if (annElement.hasAttribute(QStringLiteral("opacity"))) {
         double opacity = annElement.attribute(QStringLiteral("opacity")).toDouble();
-        aCustomOpacity = selectActionItem(aOpacity, aCustomOpacity, opacity, opacityStandardValues, GuiUtils::createOpacityIcon(opacity), i18nc("@item:inlistbox", "%1\%", opacity * 100));
+        aCustomOpacity = selectActionItem(aOpacity, aCustomOpacity, opacity, opacityStandardValues, GuiUtils::createOpacityIcon(opacity), i18nc("@item:inlistbox", "%1%", opacity * 100));
     } else {
         aOpacity->setCurrentItem(opacityStandardValues.size() - 1); // 100 %
     }
@@ -707,7 +707,7 @@ AnnotationActionHandler::AnnotationActionHandler(PageViewAnnotator *parent, KAct
     d->aOpacity = new KSelectAction(QIcon::fromTheme(QStringLiteral("edit-opacity")), i18nc("@action:intoolbar Current annotation config option", "Opacity"), this);
     d->aOpacity->setToolBarMode(KSelectAction::MenuMode);
     for (double opacity : d->opacityStandardValues) {
-        KToggleAction *ann = new KToggleAction(GuiUtils::createOpacityIcon(opacity), QStringLiteral("%1\%").arg(opacity * 100), this);
+        KToggleAction *ann = new KToggleAction(GuiUtils::createOpacityIcon(opacity), QStringLiteral("%1%").arg(opacity * 100), this);
         d->aOpacity->addAction(ann);
         connect(ann, &QAction::triggered, this, [this, opacity]() { d->annotator->setAnnotationOpacity(opacity); });
     }