patch 9.1.1504: filetype: numbat files are not recognized

Problem:  filetype: numbat files are not recognized
Solution: detect *.nbt files as numbat filetype (0xadk)

References:
- https://github.com/sharkdp/numbat
- https://github.com/sharkdp/numbat/tree/master/numbat/modules

closes: #17643

Signed-off-by: 0xadk <0xadk@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1504,
 /**/
     1503,
 /**/