Depend on config rule instead of file.

The aos_config rule used to require you to depend on {name}.json to get
the output.  That was weird and hid private/testonly/etc.  Instead,
depend on the rule directly.

Change-Id: I1596a6c1f44b246a0db1bbc562468530a0b69614
diff --git a/y2019/BUILD b/y2019/BUILD
index e286fc7..1d8b996 100644
--- a/y2019/BUILD
+++ b/y2019/BUILD
@@ -5,7 +5,7 @@
 
 robot_downloader(
     data = [
-        ":config.json",
+        ":config",
     ],
     dirs = [
         "//y2019/vision/server:www_files",
diff --git a/y2019/control_loops/drivetrain/BUILD b/y2019/control_loops/drivetrain/BUILD
index cd3a793..c500ce6 100644
--- a/y2019/control_loops/drivetrain/BUILD
+++ b/y2019/control_loops/drivetrain/BUILD
@@ -127,7 +127,7 @@
 cc_test(
     name = "target_selector_test",
     srcs = ["target_selector_test.cc"],
-    data = ["//y2019:config.json"],
+    data = ["//y2019:config"],
     deps = [
         ":target_selector",
         "//aos/events:simulated_event_loop",
@@ -192,7 +192,7 @@
 cc_test(
     name = "localized_drivetrain_test",
     srcs = ["localized_drivetrain_test.cc"],
-    data = [":simulation_config.json"],
+    data = [":simulation_config"],
     deps = [
         ":camera_fbs",
         ":drivetrain_base",
@@ -210,7 +210,7 @@
 cc_binary(
     name = "drivetrain_replay",
     srcs = ["drivetrain_replay.cc"],
-    data = ["//y2019:config.json"],
+    data = ["//y2019:config"],
     deps = [
         ":drivetrain_base",
         ":event_loop_localizer",
diff --git a/y2019/control_loops/superstructure/BUILD b/y2019/control_loops/superstructure/BUILD
index ed0c916..c352ba6 100644
--- a/y2019/control_loops/superstructure/BUILD
+++ b/y2019/control_loops/superstructure/BUILD
@@ -75,7 +75,7 @@
         "superstructure_lib_test.cc",
     ],
     data = [
-        "//y2019:config.json",
+        "//y2019:config",
     ],
     deps = [
         ":superstructure_goal_fbs",