Fix Wownero API compatibility

- Remove #ifndef LWSF_MASTER_ENABLE guards around lightWalletLogin
  and lightWalletImportWalletRequest - these are pure virtual in
  Wownero's wallet2_api.h so must always be implemented

src/wallet.cpp

@@ -2117,7 +2117,7 @@ namespace lwsf { namespace internal
     return out.str();
   }
 
-#ifndef LWSF_MASTER_ENABLE
+  // NOTE: These functions are always needed for Wownero (they're pure virtual in wallet2_api.h)
   bool wallet::lightWalletLogin(bool &isNewWallet) const
   {
     isNewWallet = false;

src/wallet.h

@@ -747,13 +747,11 @@ namespace internal
     //! secondary key reuse mitigation
     virtual void keyReuseMitigation2(bool mitigation) override {  /* TODO */ }
 
-#ifndef LWSF_MASTER_ENABLE
     //! Light wallet authenticate and login
     virtual bool lightWalletLogin(bool &isNewWallet) const override;
 
     //! Initiates a light wallet import wallet request
     virtual bool lightWalletImportWalletRequest(std::string &payment_id, uint64_t &fee, bool &new_request, bool &request_fulfilled, std::string &payment_address, std::string &status) override;
-#endif // LWSF_MASTER_ENABLE
 
     //! locks/unlocks the keys file; returns true on success
     virtual bool lockKeysFile() override { return false; }