Closes #9495: Dismiss the ShareFragment in onPause()

app/src/main/java/org/mozilla/fenix/share/ShareFragment.kt

@@ -53,6 +53,11 @@ class ShareFragment : AppCompatDialogFragment() {
         setStyle(STYLE_NO_TITLE, R.style.ShareDialogStyle)
     }
 
+    override fun onPause() {
+        super.onPause()
+        dismiss()
+    }
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,