Fix #3224 Seg Fault in DrawProjGroup

- QGIViews for DrawProjGroupItem were not being deleted since
  DPGI belongs to DPG, not DrawPage.  Since there is a 1 to 1
  relationship between MDIViewPage and DrawPage, the check for
  membership in DrawPage is unnecessary.

src/Mod/TechDraw/Gui/QGVPage.cpp

@@ -217,14 +217,14 @@ int QGVPage::removeQView(QGIView *view)
     return 0;
 }
 
-int QGVPage::removeQViewByDrawView(const TechDraw::DrawView* dv)
+int QGVPage::removeQViewByName(const char* name)
 {
     std::vector<QGIView*> items = getViews();
-    QString qsName = QString::fromUtf8(dv->getNameInDocument());
+    QString qsName = QString::fromUtf8(name);
     bool found = false;
     QGIView* ourItem = nullptr;
     for (auto& i:items) {
-        if (qsName == i->data(1).toString()) {          //is there really a QGIV for this DV in scene?
+        if (qsName == i->data(1).toString()) {          //is there a QGIV with this name in scene?
             found = true;
             ourItem = i;
             break;