qt: Changes for built-in PCP+NAT-PMP

Change option help, and remove conditionals.

src/qt/forms/optionsdialog.ui

@@ -328,10 +328,10 @@
        <item>
         <widget class="QCheckBox" name="mapPortNatpmp">
          <property name="toolTip">
-          <string>Automatically open the Bitcoin client port on the router. This only works when your router supports NAT-PMP and it is enabled. The external port could be random.</string>
+          <string>Automatically open the Bitcoin client port on the router. This only works when your router supports PCP or NAT-PMP and it is enabled. The external port could be random.</string>
          </property>
          <property name="text">
-          <string>Map port using NA&amp;T-PMP</string>
+          <string>Map port using PCP or NA&amp;T-PMP</string>
          </property>
         </widget>
        </item>

src/qt/optionsdialog.cpp

@@ -108,9 +108,6 @@ OptionsDialog::OptionsDialog(QWidget* parent, bool enableWallet)
 #ifndef USE_UPNP
     ui->mapPortUpnp->setEnabled(false);
 #endif
-#ifndef USE_NATPMP
-    ui->mapPortNatpmp->setEnabled(false);
-#endif
 
     ui->proxyIp->setEnabled(false);
     ui->proxyPort->setEnabled(false);

src/qt/optionsmodel.cpp

@@ -414,11 +414,7 @@ QVariant OptionsModel::getOption(OptionID option, const std::string& suffix) con
         return false;
 #endif // USE_UPNP
     case MapPortNatpmp:
-#ifdef USE_NATPMP
         return SettingToBool(setting(), DEFAULT_NATPMP);
-#else
-        return false;
-#endif // USE_NATPMP
     case MinimizeOnClose:
         return fMinimizeOnClose;