Revert "Show line indicator instead of rectangle while dragging in tables" (#5255)

This reverts commit 0322d37650.

src/widgets/helper/TableStyles.hpp

@@ -1,32 +0,0 @@
-#pragma once
-
-#include <QProxyStyle>
-
-class QTableView;
-
-namespace chatterino {
-
-/// @brief A custom style for drag operations of rows on tables
-///
-/// This style overwrites how `PE_IndicatorItemViewItemDrop`, the drop
-/// indicator of item-views, is drawn. It's intended to be used on QTableViews
-/// where entire rows are moved (not individual cells). The indicator is shown
-/// as a line at the position where the dragged item should be inserted. If no
-/// such position exists, a red border is drawn around the viewport.
-class TableRowDragStyle : public QProxyStyle
-{
-public:
-    /// Applies the style to @a view
-    static void applyTo(QTableView *view);
-
-    void drawPrimitive(QStyle::PrimitiveElement element,
-                       const QStyleOption *option, QPainter *painter,
-                       const QWidget *widget = nullptr) const override;
-
-private:
-    /// @param target The style to wrap. This is **not** the parent of this
-    ///               object. This object will become the parent of @a target.
-    TableRowDragStyle(QStyle *target);
-};
-
-}  // namespace chatterino