Increase memory in gradle.properties to avoid OOM in android apk compilation

[emanuelb]

Compiling this app with Containerfile at: https://gitlab.com/walletscrutiny/walletScrutinyCom/-/issues/208

will fail with OOM error unless running the following command sed -i '/org.gradle.jvmargs/s/^#//g' gradle.properties; which used to uncomment this line:

BitcoinWalletMobile/android/gradle.properties

Line 13 in 56d56d7

# org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8

so it's better to increase the defaults to be enough for app compilation.