Fix permission typo

zygote->webview_zygote.

Forgot to ammend local change.

Test: webview_zygote denials are gone.
Change-Id: I02869812feafd127b39e567c28e7278133770e97

private/webview_zygote.te

@@ -55,7 +55,7 @@ selinux_check_context(webview_zygote)
 selinux_check_access(webview_zygote)
 
 # Directory listing in /system.
-allow zygote system_file:dir r_dir_perms;
+allow webview_zygote system_file:dir r_dir_perms;
 
 #####
 ##### Neverallow