[native] add farcaster icon on native

Summary:
missed this in my previous diff stack. we need to add the farcaster icon to `icons` to make it available in the action sheet.

i also resized the ethereum-outline icon because it looked too small

Depends on D13475

Test Plan:
see attached photos. farcaster icon now appears in action sheet and the ethereum icon looks right

{F2810499}

{F2810498}

(simply replaced the icon name to test the ethereum icon size, not actually using that icon for the farcaster avatar option in action sheet)

Reviewers: will

Reviewed By: will

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13476

native/avatars/avatar-hooks.js

@@ -541,7 +541,16 @@ function useShowAvatarActionSheet(
           <CommIcon
             name="ethereum-outline"
             key={option.id}
-            size={18}
+            size={22}
+            style={styles.bottomSheetIcon}
+          />
+        );
+      } else if (option.id === 'farcaster') {
+        return (
+          <CommIcon
+            name="farcaster-outline"
+            key={option.id}
+            size={22}
             style={styles.bottomSheetIcon}
           />
         );