Increase autopilot bank angle

[wpine215]

Together with #2140, should improve autopilot performance

Summary of Changes

Increase autopilot max bank angle from 20 to 25

Discord username (if different from GitHub): Iceman#5540

How to download the PR for QA

Every new commit to this PR will cause a new A32NX artifact to be created and uploaded.
The build script will have already been run with the latest changes, so no need to rerun it once you download the zip.

1. Make sure you are signed in to GitHub
2. Click on the Checks tab on the PR
3. On the right side, click on the Artifacts drop down and click the A32NX link

[Lazarus320]

Category: QA Tester
Name: Lazarus#4286
Date of testing: Current date 1/12/2020
Version of the sim: 1.11.6
PR Tested: #2154
Object of test: Autopilot bank angle

Testing technique: Loaded c/d and did a short flight
Steps you've made to test the Pull Request:

1. Took off normally
2. Tested ap bank angles with various configurations
3. Average bank
   
4. Maximum bank achieved
   

Flight notes (If required): The bank angle varies from 25 to approximately 29 which is according to what I found online from other pilots is fine since the ap bank angle will always differ depending on speed, mode, etc

Issues (If Any): N/A
Overall Rating: Good
Conclusions of the testing: The bank never exceeded 33 degrees so all looks good to me.

EDIT: Forgot to mention that the ap turn rate is more stable and better than before.