static/frontend: fix link svg rendering in darkmode

- Ensure that svgs have the correct styling in dark mode.

Change-Id: I5069e6493054d70fac7e27ec0bb6937c6baa97ba
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/734621
Reviewed-by: Nicholas Husin <nsh@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ethan Lee <ethanalee@google.com>
Reviewed-by: Nicholas Husin <husin@google.com>
kokoro-CI: kokoro <noreply+kokoro@google.com>

Author: ethanalee-work

static/frontend/frontend.min.css

@@ -34,7 +34,7 @@
           <li>
             <a href="{{.}}" title="View this module on Open Source Insights"
               target="_blank" rel="noopener" data-test-id="meta-link-depsdev">
-              <img class="depsdev-Icon" src="/static/shared/icon/depsdev-logo.svg"
+              <img class="link-Icon" src="/static/shared/icon/depsdev-logo.svg"
                 alt="Open Source Insights Logo" />
               Open Source Insights
             </a>
@@ -44,7 +44,7 @@
           <li>
             <a href="{{.}}" title="View this repo on Code Wiki"
               target="_blank" rel="noopener" data-test-id="meta-link-codewiki">
-              <img class="go-Icon" src="/static/shared/icon/codewiki-logo.svg"
+              <img class="link-Icon" src="/static/shared/icon/codewiki-logo.svg"
                 alt="Code Wiki Logo" />
               Code Wiki
             </a>

static/frontend/frontend.min.css.map

@@ -4,7 +4,7 @@
  * license that can be found in the LICENSE file.
  */
 
-.depsdev-Icon {
+.link-Icon {
   height: 1.125em;
   vertical-align: text-bottom;
   width: auto;