schema: remove duplicate keys

commit b6980b0 introduced the issue.

Signed-off-by: Chris Bandy <bandy.chris@gmail.com>

Author: cbandy

schema/config-linux.json

@@ -282,7 +282,6 @@
                 "$ref": "defs-linux.json#/definitions/Personality"
             },
             "timeOffsets": {
-                "type": "object",
                 "type": "object",
                 "properties": {
                     "boottime": {