add three-stranded-button to prefix "grw"

src/client/js/components/Navbar/ThreeStrandedButton.jsx

@@ -7,7 +7,7 @@ const ThreeStrandedButton = (props) => {
   const { t } = props;
 
   return (
-    <div className="btn-group three-stranded-button" role="group " aria-label="three-stranded-button">
+    <div className="btn-group grw-three-stranded-button" role="group " aria-label="three-stranded-button">
       <button type="button" className="btn btn-outline-primary view-button">
         <i className="icon-control-play icon-fw" />
         { t('view') }

src/client/styles/scss/theme/_apply-colors-dark.scss

@@ -207,7 +207,7 @@ ul.pagination {
   background-color: rgba($bgcolor-subnav, 0.85);
 }
 
-.three-stranded-button {
+.grw-three-stranded-button {
   .btn-outline-primary {
     &:hover {
       color: $primary;

src/client/styles/scss/theme/_apply-colors-light.scss

@@ -132,7 +132,7 @@ $table-hover-bg: $bgcolor-table-hover;
   background-color: rgba($bgcolor-subnav, 0.85);
 }
 
-.three-stranded-button {
+.grw-three-stranded-button {
   .btn-outline-primary {
     &:hover {
       color: $primary;