[wallet] Rename WalletVerify() to VerifyWallets()

This function can now verify multiple wallets.

src/wallet/init.cpp

@@ -171,7 +171,7 @@ bool WalletParameterInteraction()
     return true;
 }
 
-bool WalletVerify()
+bool VerifyWallets()
 {
     if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET))
         return true;

src/wallet/init.h

@@ -17,7 +17,7 @@ bool WalletParameterInteraction();
 //! Responsible for reading and validating the -wallet arguments and verifying the wallet database.
 //  This function will perform salvage on the wallet if requested, as long as only one wallet is
 //  being loaded (CWallet::ParameterInteraction forbids -salvagewallet, -zapwallettxes or -upgradewallet with multiwallet).
-bool WalletVerify();
+bool VerifyWallets();
 
 //! Load wallet databases.
 bool OpenWallets();