Change "View Toolbar" to "Toolbar" (#4256)

Since the menu item is inside the View menu.

Author: scootergrisen

src/windows/ui/main-window.ui

@@ -1183,7 +1183,7 @@
     <bool>true</bool>
    </property>
    <property name="text">
-    <string>View Toolbar</string>
+    <string>Toolbar</string>
    </property>
    <property name="toolTip">
     <string>View Toolbar</string>