Fix SideBySide diff editor icon

Broken in 033862f305.

Change-Id: I8930de03b02dcf2859b11218b25fa0099e957791
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/diffeditor/diffview.cpp

@@ -148,7 +148,7 @@ void UnifiedView::setSync(bool sync)
 SideBySideView::SideBySideView() : m_widget(0)
 {
     setId(SIDE_BY_SIDE_VIEW_ID);
-    setIcon(Icons::UNIFIED_DIFF.icon());
+    setIcon(Icons::SIDEBYSIDE_DIFF.icon());
     setToolTip(QCoreApplication::translate("DiffEditor::SideBySideView",
                                            "Switch to Side By Side Diff Editor"));
     setSupportsSync(true);