fonts: replace go mono with courier prime code, add iosevka to the precedence list

system/fonts/67-defaults.conf

@@ -44,7 +44,7 @@
             <string>monospace</string>
         </test>
         <edit name="family" mode="prepend" binding="same">
-            <string>Go Mono</string>
+            <string>Courier Prime Code</string>
         </edit>
     </match>
 
@@ -69,7 +69,8 @@
     <alias>
         <family>monospace</family>
         <prefer>
-            <family>Go Mono</family>
+            <family>Courier Prime Code</family>
+            <family>Iosevka</family>
             <family>Noto Sans Mono</family>
         </prefer>
     </alias>