style: increase max-height of tomselect's dropdown

frontend/src/styles/style.scss

@@ -16,6 +16,10 @@ select[multiple] {
   visibility: hidden;
 }
 
+.ts-dropdown-content {
+    max-height: 50vh; /* change this */
+}
+
 .font-base {
   font-family: $font-family-base;
 }