Treat apostrophy as backtick in custom derivation path

[jimbojw]

When entering a custom derivation path, BlueWallet only recognizes backticks (`) not apostrophes ('). If you enter a derivation path with an apostrophe, BlueWallet reports "wrong derivation path". #2240 (comment)

Instead, BlueWallet should perform a find-and-replace on the user entered string to replace apostrophes with backticks. At minimum, it should inform the user of the specific character that makes the derivation path "wrong".