Use MasterServerIP instead of the master's hostname in Theme Chooser.

Fix an issue found by Mark Kendall that was causing the Theme
Chooser to fail certain operations if the master backend's hostname
was not in DNS.  Instead of using the hostname, use the master's IP
as defined by the MasterServerIP setting.

Author: cpinkham

mythtv/programs/mythfrontend/themechooser.cpp

@@ -882,7 +882,7 @@ ThemeUpdateChecker::ThemeUpdateChecker() :
     }
 
     m_infoPackage = QString("myth://Temp@%1/remotethemes/themes.zip")
-                            .arg(gCoreContext->GetMasterHostName());
+                            .arg(gCoreContext->GetSetting("MasterServerIP"));
 
     gCoreContext->SaveSetting("ThemeUpdateStatus", QString());
 
@@ -909,7 +909,7 @@ void ThemeUpdateChecker::checkForUpdate(void)
     {
         QString remoteThemeDir =
             QString("myth://Temp@%1/remotethemes/%2/%3")
-                    .arg(gCoreContext->GetMasterHostName())
+                    .arg(gCoreContext->GetSetting("MasterServerIP"))
                     .arg(m_mythVersion).arg(GetMythUI()->GetThemeName());
         QString infoXML = remoteThemeDir;
         infoXML.append("/themeinfo.xml");