Replace all instances of fmt.Errorf(%v) with fmt.Errorf(%w) (#21551)

Found using
`find . -type f -name '*.go' -print -exec vim {} -c
':%s/fmt\.Errorf(\(.*\)%v\(.*\)err/fmt.Errorf(\1%w\2err/g' -c ':wq' \;`

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/system/setting.go

@@ -243,7 +243,7 @@ func Init() error {
 		var err error
 		GravatarSourceURL, err = url.Parse(setting.GravatarSource)
 		if err != nil {
-			return fmt.Errorf("Failed to parse Gravatar URL(%s): %v", setting.GravatarSource, err)
+			return fmt.Errorf("Failed to parse Gravatar URL(%s): %w", setting.GravatarSource, err)
 		}
 	}