Remove android.enableJetifier line from gradle.properties & jetifier usage

[emanuelb]

airgap-vault/android/gradle.properties

Line 12 in 22a8c5d

android.enableJetifier=true

See this guide for the steps to ensure it's safe to remove above line android.enableJetifier=true (check that all deps are already fully migrated to AndroidX, and migrate the ones still not migrated to it)
https://medium.com/dipien/say-bye-bye-to-android-jetifier-a7e0d388f5d6

Also remove lines of jetifier package installation and usage:

airgap-vault/package.json

Line 26 in 38a8eef

"postinstall": "jetifier && node apply-diagnostic-modules.js && node fix-qrscanner-gradle.js && yarn browserify-coinlib",

airgap-vault/package.json

Line 132 in 38a8eef

"jetifier": "1.6.6",

airgap-vault/package.json

Line 155 in 38a8eef

"jetifier": "1.6.6",

airgap-vault/package.json

Line 171 in 38a8eef

"jetifier": "^1.6.6",

airgap-vault/build/android/Dockerfile

Line 36 in 89b617d

# jetify dependencies

airgap-vault/build/android/Dockerfile

Line 48 in 89b617d

&& yarn jetifier \

Related messages from compiling app:

$ jetifier && node apply-diagnostic-modules.js && node fix-qrscanner-gradle.js && yarn browserify-coinlib
Jetifier found 140 file(s) to forward-jetify. Using 1 workers...
$ /app/node_modules/.bin/jetifier
Jetifier found 140 file(s) to forward-jetify. Using 1 workers...