patch 8.0.1813: Windows installer doesn't install terminal debugger

Problem:    Windows installer doesn't install terminal debugger.
Solution:   Add the package to the list of files to install.
diff --git a/nsis/gvim.nsi b/nsis/gvim.nsi
index a1820f4..55bb4ce 100644
--- a/nsis/gvim.nsi
+++ b/nsis/gvim.nsi
@@ -267,6 +267,9 @@
 	SetOutPath $0\pack\dist\opt\swapmouse\plugin
 	File ${VIMRT}\pack\dist\opt\swapmouse\plugin\*.*
 
+	SetOutPath $0\pack\dist\opt\termdebug\plugin
+	File ${VIMRT}\pack\dist\opt\termdebug\plugin\*.*
+
 	SetOutPath $0\plugin
 	File ${VIMRT}\plugin\*.*