chore(lint): make Migration param names consistent

[joshtrichards]

Fixes these lint warnings:

w: file:///home/runner/work/android/android/app/src/main/java/com/nextcloud/client/database/migrations/LegacyMigration.kt:29:26 The corresponding parameter in the supertype 'Migration' is named 'db'. This may cause problems when calling this function with named arguments.
w: file:///home/runner/work/android/android/app/src/main/java/com/nextcloud/client/database/migrations/Migration67to68.kt:23:26 The corresponding parameter in the supertype 'Migration' is named 'db'. This may cause problems when calling this function with named arguments.
w: file:///home/runner/work/android/android/app/src/main/java/com/nextcloud/client/database/migrations/Migration88to89.kt:17:26 The corresponding parameter in the supertype 'Migration' is named 'db'. This may cause problems when calling this function with named arguments.
w: file:///home/runner/work/android/android/app/src/main/java/com/nextcloud/client/database/migrations/RoomMigration.kt:19:26 The corresponding parameter in the supertype 'Migration' is named 'db'. This may cause problems when calling this function with named arguments.

🖼️ Screenshots

🏚️ Before	🏡 After
B	A

🏁 Checklist

• Tests written, or not not needed

[github-actions]

Codacy

SpotBugs

Category	Base	New
Bad practice	42	42
Correctness	74	74
Dodgy code	257	257
Experimental	1	1
Internationalization	7	7
Malicious code vulnerability	2	2
Multithreaded correctness	34	34
Performance	44	44
Security	18	18
Total	479	479

[github-actions]

blue-Light-Screenshot test failed, but no output was generated. Maybe a preliminary stage failed.

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/16490.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.