Merge pull request #7011 from shreya99oak/loader_col r=@shane-tomlinson

style(spinner): colour change to white

app/images/spinnerwhite.svg

@@ -0,0 +1 @@
+<svg width="73" height="73" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><linearGradient x1="93.093%" y1="52.773%" x2="68.513%" y2="119.326%" id="a"><stop stop-color="#FFF" stop-opacity="0" offset="0%"/><stop stop-color="#FFF" offset="69.37%"/><stop stop-color="#FFF" offset="100%"/><stop stop-color="#FFF" stop-opacity=".005" offset="100%"/><stop stop-color="#FFF" stop-opacity="0" offset="100%"/><stop stop-color="#FFF" stop-opacity="0" offset="100%"/></linearGradient><path id="b" d="M0 0h48v60H0z"/></defs><g transform="translate(-5 -1)" fill="none" fill-rule="evenodd"><path d="M41.8 73.8c-19.9 0-36-16.1-36-36 0-19.7 15.8-35.6 35.3-36h.7c2.8.4 5 2.7 5 5.5s-2.2 5.2-5 5.4c-13.8.1-25 11.3-25 25.1s11.2 25 25 25 25-11.2 25-25h11c0 19.9-16.1 36-36 36z" fill="url(#a)"/><mask id="c" fill="#fff"><use xlink:href="#b"/></mask><path d="M41.8 73.8c-19.9 0-36-16.1-36-36 0-19.7 15.8-35.6 35.3-36h.7c2.8.4 5 2.7 5 5.5s-2.2 5.2-5 5.4c-13.8.1-25 11.3-25 25.1s11.2 25 25 25 25-11.2 25-25h11c0 19.9-16.1 36-36 36z" fill="#FFF" mask="url(#c)"/></g></svg>

app/styles/modules/_spinner.scss

@@ -40,7 +40,8 @@
 
   .button-row &,
   .input-row & {
-    @include hidpi-background-image('spinnergrey', 33px 33px);
+    background-image: url('/images/spinnerwhite.svg');
+    background-size: 33px 33px;
     height: 33px;
     margin: 0 auto;
     position: relative;