Added tabbed_window.lua to the installation

Author: nickgammon

install/mushclient.nsi

@@ -366,6 +366,7 @@ SetOverwrite ifnewer
    File "..\lua\show_loaded.lua"
    File "..\lua\strict.lua"
    File "..\lua\string_indexing.lua"
+   File "..\lua\tabbed_window.lua"
    File "..\lua\tprint.lua"
    File "..\lua\var.lua"
    File "..\lua\wait.lua"
@@ -588,6 +589,7 @@ Section Uninstall
   Delete "$INSTDIR\lua\show_loaded.lua"
   Delete "$INSTDIR\lua\strict.lua"
   Delete "$INSTDIR\lua\string_indexing.lua"
+  Delete "$INSTDIR\lua\tabbed_window.lua"
   Delete "$INSTDIR\lua\tprint.lua"
   Delete "$INSTDIR\lua\var.lua"
   Delete "$INSTDIR\lua\wait.lua"