Removing selection styling from sass files

- removed ::selection css from reset.scss
- removed variables from variables.scss
- removed variable calls from course/base/base.scss and base/base.scss

lms/static/sass/base/_reset.scss

@@ -9,9 +9,6 @@ html { font-size: 100%; -webkit-text-size-adjust: 100%; -ms-text-size-adjust: 10
 html, button, input, select, textarea { font-family: sans-serif; color: #222; }
 body { margin: 0; font-size: 1em; line-height: 1.4; }
 
-::-moz-selection { background: #fe57a1; color: #fff; text-shadow: none; }
-::selection { background: #fe57a1; color: #fff; text-shadow: none; }
-
 a { color: #00e; }
 a:visited { color: #551a8b; }
 a:hover { color: #06e; }

lms/static/sass/base/_variables.scss

@@ -104,8 +104,6 @@ $border-color-4: rgb(252,252,252);
 $link-color: $blue;
 $link-color-d1: $m-blue;
 $link-hover: $pink;
-$selection-color-1: $pink;
-$selection-color-2: #444;
 $site-status-color: $pink;
 
 $button-color: $blue;

lms/static/sass/course/base/_base.scss

@@ -101,12 +101,6 @@ img {
   max-width: 100%;
 }
 
-::selection, ::-moz-selection, ::-webkit-selection {
-  background: $selection-color-2;
-  color: #fff;
-}
-
-
 .tooltip {
   position: absolute;
   top: 0;