style: minor optimization in header scss

Author: line-o

src/main/frontend/sass/_layout.scss

@@ -1,14 +1,11 @@
 @media (min-width: 767px) {
-  #header {
-    background: var(--white) url(../images/header.gif) top right no-repeat;
-    #logo {
-      display: block;
-      width: 12.75rem;
-      aspect-ratio: 7/3;
-      background: url(../images/existdb-web.svg) center left no-repeat;
-      text-indent: -999em;
-      outline: 0;
-    }
+  #logo {
+    display: block;
+    width: 12.75rem;
+    aspect-ratio: 7/3;
+    background: url(../images/existdb-web.svg) center left no-repeat;
+    text-indent: -999em;
+    outline: 0;
   }
 }