Give better name to parameter checking function

This function will throw exceptions if the required parameters do not
exsit hence a stronger word is more appropriate here.

Also change the function parameter type to QVector. We don't need the
duplicate entries checking as currently we only use 3 fields at max and
can be easily checked by hand. So drop back to QVector which can be
constructed more efficiently.

src/webui/api/appcontroller.cpp

@@ -316,7 +316,7 @@ void AppController::preferencesAction()
 
 void AppController::setPreferencesAction()
 {
-    checkParams({"json"});
+    requireParams({"json"});
 
     Preferences *const pref = Preferences::instance();
     auto session = BitTorrent::Session::instance();
@@ -762,7 +762,7 @@ void AppController::networkInterfaceListAction()
 
 void AppController::networkInterfaceAddressListAction()
 {
-    checkParams({"iface"});
+    requireParams({"iface"});
 
     const QString ifaceName = params().value("iface");
     QJsonArray addressList;