CB/ui: Adjust primary colour

Author: fnetX

web_src/less/_base.less

@@ -7,7 +7,7 @@
   --border-radius: .28571429rem;
   --opacity-disabled: .55;
   --height-loading: 12rem;
-  --color-primary: #4183c4;
+  --color-primary: #2185D0;
   --color-primary-dark-1: #3876b3;
   --color-primary-dark-2: #31699f;
   --color-primary-dark-3: #2b5c8b;