Change wiki preformat font to be more readable

Gerrit 2.1-rc1 changed its font for monospace to include
'Lucida Console', 'Lucida Sans Typewriter', and 'Monaco'
as these can often produce more readable monospace text,
especially when the string "call11" is used.

Change-Id: I0420cf2613f12a5e7991ce7acf90a05ce28faddd
Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/src/main/java/com/google/gwtexpui/safehtml/client/safehtml.css b/src/main/java/com/google/gwtexpui/safehtml/client/safehtml.css
index 0db8116..f612200 100644
--- a/src/main/java/com/google/gwtexpui/safehtml/client/safehtml.css
+++ b/src/main/java/com/google/gwtexpui/safehtml/client/safehtml.css
@@ -15,7 +15,7 @@
 
 .wikiPreFormat {
   white-space: pre;
-  font-family: monospace;
+  font-family: 'Lucida Console', 'Lucida Sans Typewriter', Monaco, monospace;
   font-size: small;
 }