chore(sass): Allow camel case class names

.sass-lint.yml

@@ -4,8 +4,8 @@ options:
 files:
   include: 'system-addon/content-src/**/*.scss'
 
-
 rules:
+  class-name-format: [{convention: ["hyphenatedlowercase", "camelcase"]}]
   extends-before-declarations: 2
   extends-before-mixins: 2
   force-element-nesting: 0
@@ -23,4 +23,3 @@ rules:
   no-warn: 1
   placeholder-in-extend: 2
   property-sort-order: 0
-

system-addon/content-src/components/Search/_Search.scss

@@ -71,7 +71,6 @@
 
 @at-root {
   // Adjust the style of the contentSearchUI-generated table
-  // sass-lint:disable-block class-name-format
   .contentSearchSuggestionTable {
     background-color: var(--newtab-search-dropdown-color);
     border: 0;

system-addon/content-src/styles/_icons.scss

@@ -89,7 +89,7 @@
     background-image: url('#{$image-path}glyph-pocket-16.svg');
   }
 
-  &.icon-historyItem { // sass-lint:disable-line class-name-format
+  &.icon-historyItem {
     background-image: url('#{$image-path}glyph-historyItem-16.svg');
   }