Fix build breaker: add missing string resource

(cherry picked from commit c5a4e46f)

desktop/source/app/desktop.hrc

@@ -48,6 +48,7 @@
 #define STR_BOOTSTRAP_ERR_NO_CFG_SERVICE    (RID_DESKTOP_STRING_START+121)
 #define STR_BOOTSTRAP_ERR_CFG_DATAACCESS    (RID_DESKTOP_STRING_START+122)
 #define STR_BOOTSTRAP_ERR_NO_PATHSET_SERVICE (RID_DESKTOP_STRING_START+123)
+#define STR_BOOTSTRAP_ERR_MULTISESSION       (RID_DESKTOP_STRING_START+124)
 
 #define STR_ASK_START_SETUP_MANUALLY        (RID_DESKTOP_STRING_START+152)
 

desktop/source/app/desktop.src

@@ -90,6 +90,11 @@ String STR_BOOTSTRAP_ERR_NO_CFG_SERVICE
     Text [ en-US ] = "The configuration service is not available.";
 };
 
+String STR_BOOTSTRAP_ERR_MULTISESSION
+{
+    Text [ en-US ] = "You have another instance running in a different terminal session. Close that instance and then try again.";
+};
+
 String STR_ASK_START_SETUP_MANUALLY
 {
     Text [ en-US ] = "Start the setup application to repair the installation from the CD or the folder containing the installation packages.";