Allow the toolbar to be docked into the top of the window if somehow it should

become undocked

Author: e-pettersen

src/bundles/toolbar/bundle_info.xml

@@ -1,6 +1,6 @@
 <!-- vi:set shiftwidth=2: -->
 <BundleInfo name="ChimeraX-Toolbar"
-	    version="1.2.3" package="chimerax.toolbar"
+	    version="1.2.4" package="chimerax.toolbar"
   	    minSessionVersion="1" maxSessionVersion="1">
 
   <Author>UCSF RBVI</Author>

src/bundles/toolbar/src/tool.py

@@ -111,7 +111,7 @@ def _build_ui(self):
         layout.addWidget(self.ttb)
         self._build_tabs()
         self.tool_window.ui_area.setLayout(layout)
-        self.tool_window.manage(self.PLACEMENT)
+        self.tool_window.manage(self.PLACEMENT, allowed_areas=Qt.AllDockWidgetAreas)
 
     def _color_scheme_changed(self, *_):
         from chimerax.ui.widgets.tabbedtoolbar import TabbedToolbar