Move OWNER reference master=>main.

BUG=b/291759353

Change-Id: If24e90debb32600759c4c1b1dbd0005f77c7e5db
diff --git a/OWNERS b/OWNERS
index 62c5737..c24680e 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,2 @@
 set noparent
-file:platform/packages/modules/Connectivity:master:/OWNERS_core_networking
+file:platform/packages/modules/Connectivity:main:/OWNERS_core_networking