patch 8.2.2551: MS-Windows: colors test file is not installed

Problem:    MS-Windows: colors test file is not installed.
Solution:   Also copy runtime/colors/tools. (Ken Takata, closes #7902)
diff --git a/nsis/gvim.nsi b/nsis/gvim.nsi
index 4521fc2..498d98d 100644
--- a/nsis/gvim.nsi
+++ b/nsis/gvim.nsi
@@ -359,6 +359,8 @@
 
 	SetOutPath $0\colors
 	File ${VIMRT}\colors\*.*
+	SetOutPath $0\colors\tools
+	File ${VIMRT}\colors\tools\*.*
 
 	SetOutPath $0\compiler
 	File ${VIMRT}\compiler\*.*