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\*.*
diff --git a/src/version.c b/src/version.c
index 0ab83f7..07c793d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2551,
+/**/
     2550,
 /**/
     2549,