DRY: Remove default parameter value handeling in __package_pkg_freebsd

flavor, pkgsite and version are expected to be empty.
They're all checked with [ -n "$var" ]

cdist/conf/type/__package_pkg_freebsd/gencode-remote

@@ -51,23 +51,10 @@ else
 	name="$__object_id"
 fi
 
-if [ -f "$__object/parameter/flavor" ]; then
 flavor="$(cat "$__object/parameter/flavor")"
-fi
-
-if [ -f "$__object/parameter/version" ]; then
 version="$(cat "$__object/parameter/version")"
-fi
-
-if [ -f "$__object/parameter/pkgsite" ]; then
 pkgsite="$(cat "$__object/parameter/pkgsite")"
-fi
-
-if [ -f "$__object/parameter/state" ]; then
 state="$(cat "$__object/parameter/state")"
-else
-   state="present"
-fi
 curr_version="$(cat "$__object/explorer/pkg_version")"
 add_cmd="pkg_add"
 rm_cmd="pkg_delete"

cdist/conf/type/__package_pkg_freebsd/parameter/default/state

@@ -0,0 +1 @@
+present