Ensure the Custom Chrome tab is removed from the backstack (#708)

app/src/main/java/com/x8bit/bitwarden/WebAuthCallbackActivity.kt

@@ -24,9 +24,12 @@ class WebAuthCallbackActivity : AppCompatActivity() {
 
         val intent = Intent(this, MainActivity::class.java)
             .apply {
-                addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT)
+                addFlags(
+                    Intent.FLAG_ACTIVITY_CLEAR_TOP or
+                        Intent.FLAG_ACTIVITY_SINGLE_TOP,
+                )
             }
         startActivity(intent)
-        finishAffinity()
+        finish()
     }
 }