Update GS_TCP_Client.h

fix impossible if condition when trying to use TinyGSM with disabled wifi and disabled ethernet

Author: Dominggus Salampessy

src/client/GS_TCP_Client.h

@@ -420,7 +420,7 @@ class GS_TCP_Client : public Client
     if (_client_type == esp_google_sheet_client_type_external_basic_client &&
         (!_network_connection_cb || !_network_status_cb))
       rdy = false;
-    else if (_client_type != esp_google_sheet_client_type_external_basic_client ||
+    else if (_client_type != esp_google_sheet_client_type_external_basic_client &&
              _client_type != esp_google_sheet_client_type_external_gsm_client)
       rdy = false;
 #else