reset nature-border-color and delete apply-colors-nature and replace apply-colors-light as apply-colors-nature for nature-theme

resource/styles/agile-admin/inverse/colors/nature.scss

@@ -11,7 +11,6 @@ $bodytext: #333333;
 $linktext: lighten($themecolor,5%);
 $linktext-hover: lighten($linktext, 12%);
 $sidebar-text:#5c7253;
-$border: #e9f0de;
 
 $primary: $themecolor;
 
@@ -20,4 +19,4 @@ $wikilinktext: lighten($themecolor, 20%);
 $wikilinktext-hover: lighten($wikilinktext, 20%);
 
 @import 'apply-colors';
-@import 'apply-colors-nature';
+@import 'apply-colors-light';