Hiding privacy grade toolbar button when returning to home activity (#163)

Author: CDRussell

app/src/main/java/com/duckduckgo/app/browser/BrowserActivity.kt

@@ -473,6 +473,7 @@ class BrowserActivity : DuckDuckGoActivity(), BookmarkDialogCreationListener {
 
     private fun clearViewPriorToAnimation() {
         acceptingRenderUpdates = false
+        privacyGradeMenu?.isVisible = false
         omnibarTextInput.text.clear()
         omnibarTextInput.hideKeyboard()
         webView.hide()