Fix "Review markup logo not visible on dark mode"

Fixed link icon not visible in dark mode by replacing hardcoded stroke color with currentColor so it respects theme styling.

PluginBuilder/wwwroot/img/icon-sprite.svg

@@ -414,8 +414,8 @@
     </symbol>
 
     <symbol id="link" viewBox="0 0 24 24">
-        <path fill="none" d="M10.0464 14C8.54044 12.4882 8.67609 9.90087 10.3494 8.22108L15.197 3.35462C16.8703 1.67483 19.4476 1.53865 20.9536 3.05046C22.4596 4.56228 22.3239 7.14956 20.6506 8.82935L18.2268 11.2626" stroke="#1C274C" stroke-width="1.5" stroke-linecap="round"/>
-        <path fill="none" d="M13.9536 10C15.4596 11.5118 15.3239 14.0991 13.6506 15.7789L11.2268 18.2121L8.80299 20.6454C7.12969 22.3252 4.55237 22.4613 3.0464 20.9495C1.54043 19.4377 1.67609 16.8504 3.34939 15.1706L5.77323 12.7373" stroke="#1C274C" stroke-width="1.5" stroke-linecap="round"/>
+        <path fill="none" d="M10.0464 14C8.54044 12.4882 8.67609 9.90087 10.3494 8.22108L15.197 3.35462C16.8703 1.67483 19.4476 1.53865 20.9536 3.05046C22.4596 4.56228 22.3239 7.14956 20.6506 8.82935L18.2268 11.2626" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+        <path fill="none" d="M13.9536 10C15.4596 11.5118 15.3239 14.0991 13.6506 15.7789L11.2268 18.2121L8.80299 20.6454C7.12969 22.3252 4.55237 22.4613 3.0464 20.9495C1.54043 19.4377 1.67609 16.8504 3.34939 15.1706L5.77323 12.7373" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
     </symbol>
     <symbol id="cross" viewBox="0 0 24 24">
         <path d="m 12.130988,3.8368041 c 0.1405,0.14063 0.2194,0.33125 0.2194,0.53 0,0.19875 -0.0789,0.38937 -0.2194,0.53 0,0 -7.1796704,7.1797099 -7.2499804,7.2499599 -0.4782845,0.337104 -0.6862778,0.290768 -1.06,0 -0.3737222,-0.290768 -0.019811,-1.025771 -0.019811,-1.025771 L 11.070988,3.8368041 c 0.1406,-0.14045 0.3313,-0.21934 0.53,-0.21934 0.1988,0 0.3894,0.07889 0.53,0.21934 z" fill="currentColor" />