Fix OWNERS for SpaLib

SettingsLib's xml files does not need owners approval, but SpaLib's xml
files will be protected by owners approval.

Set "per-file *.xml = set noparent" will also remove all owners, which
means no owners can approve.

So move the "set noparent" to the SpaLib level to fix.

Bug: 235727273
Test: n/a
Change-Id: I2c20c788688698afec63001f3af3693568bae034
diff --git a/packages/SettingsLib/Spa/OWNERS b/packages/SettingsLib/Spa/OWNERS
index b352b04..2887872 100644
--- a/packages/SettingsLib/Spa/OWNERS
+++ b/packages/SettingsLib/Spa/OWNERS
@@ -1,6 +1,6 @@
+set noparent
+
 chaohuiw@google.com
 hanxu@google.com
 kellyz@google.com
 pierreqian@google.com
-
-per-file *.xml = set noparent