cleaned up padding for peer review training and grading states, removed extraneous response label,fixed style issue on rubric for peer grading where rubric items had a background color overridding the intended style

common/lib/xmodule/xmodule/css/combinedopenended/display.scss

@@ -266,8 +266,6 @@ div.combined-rubric-container {
 
   h4 {
     padding-top: $baseline/2;
-    border-color: lightgray;
-    border-top: 1px solid;
   }
 
   span.rubric-category {
@@ -892,7 +890,6 @@ section.open-ended-child {
 
 .oe-tools {
   display: inline-block;
-  padding-left: $baseline;
   width: 100%;
   border-radius: 5px;
 
@@ -910,7 +907,7 @@ section.open-ended-child {
   .rubric-previous-button {
     margin-right: $baseline/4;
   }
-  
+
   .rubric-next-button {
     margin-left: $baseline/4;
   }

common/lib/xmodule/xmodule/js/fixtures/combined-open-ended.html

@@ -42,7 +42,7 @@
         </div>
       </div>
       <div class="oe-tools response-tools">
-        <span class="oe-tools-label">Response: </span>
+        <span class="oe-tools-label"></span>
         <input type="button" value="Reset" class="reset-button" name="reset" style="display: none;">
       </div>
       <input type="button" value="Next Step" class="next-step-button" name="reset" style="display: none;">

common/lib/xmodule/xmodule/js/fixtures/rubric.html

@@ -78,7 +78,7 @@
         </div>
     </div>
     <div class="oe-tools response-tools">
-        <span class="oe-tools-label">Response: </span>
+        <span class="oe-tools-label"></span>
         <input type="button" value="Reset" class="reset-button" name="reset" style="display: inline-block;">
     </div>
 </div>