[epiphany] About.css: remove fallback fonts (they're not being used ever)

[Michael Catanzaro <mcatanzaro src gnome org>]

commit ee74a77a2935f8735b2c1e7c3ed43e0156eab6ac
Author: Tobias Bernard <tbernard gnome org>
Date:   Mon Jul 22 13:25:40 2019 +0200

    About.css: remove fallback fonts (they're not being used ever)

 src/resources/about.css | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/resources/about.css b/src/resources/about.css
index cb464b68d..b3aecf082 100644
--- a/src/resources/about.css
+++ b/src/resources/about.css
@@ -7,7 +7,7 @@ body {
 }
 
 html {
-    font-family: -webkit-system-font, Cantarell, sans-serif;
+    font-family: -webkit-system-font;
     font-size: 11pt;
     color: #2e3436;
     background-color: #f6f6f4;
@@ -264,7 +264,7 @@ html.epiphany-html {
     display: inherit;
     white-space: nowrap;
     overflow: hidden;
-    font-family: -webkit-system-font, Cantarell, sans-serif;
+    font-family: -webkit-system-font;
     font-size: 11pt;
     color: #2e3436;
     text-overflow: ellipsis;