bug: large title/back-button animation is broken when had menu-button

#20796 Bug Report

**Ionic version:**

[x] **5.x**

**Current behavior:**
When navigating from page A to page B, both with a large title and menu button, the back button of the entering page is displayed too early and overlaps with the menu button, then jumps into position.
If no menu-button is present it is working as intended.


**Expected behavior:**
Animations smooth as butter :)

**Steps to reproduce:**
Just navigate to a page with menu button and large title.

**Related code:**
A sample application via GitHub
https://github.com/theopavan/project

**Other information:**

**Ionic info:**

```
Ionic:

Ionic CLI : 6.6.0 (/Users/theo/.nvm/versions/node/v10.15.0/lib/node_modules/@ionic/cli)
Ionic Framework : @ionic/angular 5.1.0
@angular-devkit/build-angular : 0.803.26
@angular-devkit/schematics : 8.3.26
@angular/cli : 8.3.26
@ionic/angular-toolkit : 2.2.0

Cordova:

Cordova CLI : 9.0.0 (cordova-lib@9.0.1)
Cordova Platforms : android 8.1.0, ios 5.1.1
Cordova Plugins : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 4.1.3, (and 6 other plugins)

Utility:

cordova-res (update available: 0.14.0) : 0.6.0
native-run (update available: 1.0.0) : 0.2.8

System:

Android SDK Tools : 26.1.1 (/Users/theo/Library/Android/sdk)
ios-deploy : 1.9.4
ios-sim : 8.0.2
NodeJS : v10.15.0 (/Users/theo/.nvm/versions/node/v10.15.0/bin/node)
npm : 6.4.1
OS : macOS Catalina
Xcode : Xcode 11.4.1 Build version 11E503a
```

Start with the linked sample application and reproduce navigation between pages that both use a large title and menu button. Trace the Ionic Angular transition behavior for the entering page's back button; done means the back button no longer appears early, overlaps the menu button, or jumps during the animation.

由索引模型根据 Issue 内容生成。