Correct path for uploading installer images.

The installer images are currently being uploaded to
`public/installers/v2019dev0/installer/...`, but should be uploaded to
`public/daily/v2019dev0/installer/...`.

Tweak the Jenkinsfile to upload the images to the correct location.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

Jenkinsfile

@@ -444,7 +444,7 @@ def buildInstallers(installerTargets) {
 
                 // Upload artifacts
                 stage("installers upload") {
-                  uploadDirectory (env.PIPELINE_VERSION, "installers/${release}")
+                  uploadDirectory (env.PIPELINE_VERSION, "daily/${release}")
                 }
               } finally {
                 stage("Cleanup installers") {