Fix android_id_from_name to accept "app_0" as a valid ID.

This fixes getpwnam and getpwgrp which returned NULL for "app_0".
"app_0" corresponds to uid/gid 10000 and is perfectly valid.
diff --git a/libc/bionic/stubs.c b/libc/bionic/stubs.c
index 586d497..d495674 100644
--- a/libc/bionic/stubs.c
+++ b/libc/bionic/stubs.c
@@ -185,7 +185,7 @@
         goto FAIL;
 
     id = strtoul(name+4, &end, 10);
-    if (id == 0 || *end != '\0')
+    if (*end != '\0')
         goto FAIL;
 
     id += AID_APP;