Fixed issue with light theme introduced by #15333

public/sass/_variables.light.scss

@@ -56,7 +56,7 @@ $page-bg: $gray-7;
 $body-color: $gray-1;
 $text-color: $gray-1;
 $text-color-strong: $dark-2;
-$text-color-weak: $gray-3;
+$text-color-weak: $gray-2;
 $text-color-faint: $gray-4;
 $text-color-emphasis: $dark-5;
 

public/sass/components/_query_editor.scss

@@ -124,7 +124,7 @@ input[type='text'].tight-form-func-param {
 
   &--disabled {
     .query-keyword {
-      color: darken($blue, 20%);
+      color: $text-color-weak;
     }
   }