Merge pull request #6197 from edx/talbs/fix-lms-calculator-toggle

FIX - LMS: removing un-needed utility Sass mixin from calc styling

lms/static/sass/course/layout/_calculator.scss

@@ -19,7 +19,6 @@ div.calc-main {
     color: #fff;
     float: right;
     height: 20px;
-    @include hide-text;
     display: inline-block;
     margin-right: 10px;
     padding: 8px 12px;