Update usermods/usermod_v2_brightness_follow_sun/library.json

Fix incorrect module name in library.json

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: willmmiles

usermods/usermod_v2_brightness_follow_sun/library.json

@@ -1,3 +1,3 @@
 {
-  "name": "brightness_follow_sum"
+  "name": "brightness_follow_sun"
 }