Fix support version.

Should still be 18.0.0 but looks like the schemas doesn't support this (yet?).

Change-Id: I2bf61debad74b04ea3678b3226c833abb197ca8f
diff --git a/sdk/support_source.properties b/sdk/support_source.properties
index c78fc9d..1617096 100644
--- a/sdk/support_source.properties
+++ b/sdk/support_source.properties
@@ -1,5 +1,5 @@
 Pkg.UserSrc=false
-Pkg.Revision=18.0.0
+Pkg.Revision=18
 Extra.Vendor=android
 Extra.VendorId=android
 Extra.VendorDisplay=Android