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)

nsis/gvim.nsi

@@ -359,6 +359,8 @@ Section "$(str_section_exe)" id_section_exe
 
 	SetOutPath $0\colors
 	File ${VIMRT}\colors\*.*
+	SetOutPath $0\colors\tools
+	File ${VIMRT}\colors\tools\*.*
 
 	SetOutPath $0\compiler
 	File ${VIMRT}\compiler\*.*

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2551,
 /**/
     2550,
 /**/