App crash on load battle config with invalid file selection

[item4]

Preparation

• I tested the latest release
• I looked at other issues (even the closed ones)
• I read the Troubleshooting Guide

FGO server

KR

FGA build number

1801

Describe the bug

1. Click Load AB config button
2. Select invalid file such as .mp4 (not correct .fga file)

Video

(Maybe not required for this case)

Device model

Galaxy Note 20 Ultra

Android version

12

Screen size

Doesn't matter

RAM

Doesn't matter

[reconman]

Android only seems to accept files with .json extensions now.

So existing battle config files need to be renamed to .json before they can be imported.