Settings option string to view seed should remove reference to 12-word

[ghost]

samourai-wallet-android/app/src/main/res/values/strings.xml

Line 32 in cfcea01

<string name="options_mnemonic2">Show 12-word seed for this wallet.</string>

A new wallet generated by the app will have 12-words but a wallet imported by the user may not. It would be more appropriate to remove the reference to the seed size in the string and instead say "Show seed for this wallet."