Adjusted colour of refresh icon to be consistent with other icons

src/Insight/UserInterfaces/InsightWindow/Images/refresh.svg

@@ -22,7 +22,7 @@
         <dc:format>image/svg+xml</dc:format>
         <dc:type
            rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
-        <dc:title></dc:title>
+        <dc:title />
       </cc:Work>
     </rdf:RDF>
   </metadata>
@@ -57,5 +57,5 @@
   <path
      d="M 7.875,10 4.7137084,13.519709 1.5,10 h 2.125 c 0,-3.5204166 2.8545834,-6.375 6.375,-6.375 1.696459,0 3.233541,0.66725 4.376791,1.7481666 l -1.4195,1.5802918 C 12.191584,6.2097084 11.148916,5.75 10,5.75 7.656125,5.75 5.75,7.656125 5.75,10 Z M 15.286291,6.4802916 12.125,10 h 2.125 c 0,2.343875 -1.906125,4.25 -4.25,4.25 -1.149625,0 -2.1915834,-0.460416 -2.9572916,-1.203459 l -1.4195,1.580293 C 6.76575,15.70775 8.3035416,16.375 10,16.375 c 3.520416,0 6.375,-2.854584 6.375,-6.375 H 18.5 Z"
      id="path2662"
-     style="fill:#a6a8ab;fill-opacity:1;stroke-width:0.708334" />
+     style="fill:#838382;fill-opacity:1;stroke-width:0.708334" />
 </svg>