[config] update test-deploy-config to include odd characters

tests/apps/config/check_deploy

@@ -12,4 +12,5 @@ test_url () {
 
 base_url="$1"
 test_url / "config-test"
-test_url /hello "Hello world"
+test_url /hello "Hello
+ 'world'"

tests/apps/config/post-deploy

@@ -4,6 +4,7 @@ set -ex;
 REMOTE=$1
 REPO=$2
 
-# setting config variables with spaces is broken at the moment. ref: 820
-# ssh "$REMOTE" config:set "$REPO" CONFTEST=config-test HELLO=\"Hello world\"
-dokku config:set "$REPO" CONFTEST=config-test HELLO="Hello world"
+GREETING=$(printf "Hello
+ 'world'" | base64)
+ssh "$REMOTE" config:set "$REPO" CONFTEST=config-test
+ssh "$REMOTE" config:set --encoded "$REPO" HELLO="$GREETING"