Sass: changed color in gradient in template files to lower case (#18921)

packages/grafana-ui/src/themes/_variables.dark.scss.tmpl.ts

@@ -88,8 +88,8 @@ $text-shadow-faint: 1px 1px 4px rgb(45, 45, 45);
 $textShadow: none;
 
 // gradients
-$brand-gradient-horizontal: linear-gradient(to right, #F05A28 30%, #FBCA0A 99%);
-$brand-gradient-vertical: linear-gradient(#F05A28 30%, #FBCA0A 99%);
+$brand-gradient-horizontal: linear-gradient(to right, #f05a28 30%, #fbca0a 99%);
+$brand-gradient-vertical: linear-gradient(#f05a28 30%, #fbca0a 99%);
 $page-gradient: linear-gradient(180deg, $dark-5 10px, dark-2 100px);
 $edit-gradient: linear-gradient(180deg, $dark-2 50%, $input-black);
 

packages/grafana-ui/src/themes/_variables.light.scss.tmpl.ts

@@ -80,8 +80,8 @@ $text-color-emphasis: ${theme.colors.textEmphasis};
 $text-shadow-faint: none;
 
 // gradients
-$brand-gradient-horizontal: linear-gradient(to right, #F05A28 30%, #FBCA0A 99%);
-$brand-gradient-vertical: linear-gradient(#F05A28 30%, #FBCA0A 99%);
+$brand-gradient-horizontal: linear-gradient(to right, #f05a28 30%, #fbca0a 99%);
+$brand-gradient-vertical: linear-gradient(#f05a28 30%, #fbca0a 99%);
 $page-gradient: linear-gradient(180deg, $white 10px, $gray-7 100px);
 $edit-gradient: linear-gradient(-60deg, $gray-7, #f5f6f9 70%, $gray-7 98%);