Fix SPICE proxy tunnel: proxy URL was written into host= instead of a real proxy= line

Proxmox's spiceproxy API returns proxy as a ready-made "http://<addr>:3128"
URL and host as the real (often cluster-internal) SPICE target. buildVVFile
picked params.proxy first and wrote that whole URL into the .vv file's
host= field, and never emitted a proxy= line at all — so virt-viewer tried
to dial "http://<ip>:3128" as a literal hostname instead of tunneling
through the proxy, and every connection failed.

Bump to 1.0.7.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "proxmox-spice-client",
-  "version": "1.0.6",
+  "version": "1.0.7",
   "description": "VDI SPICE Client f\u00fcr Proxmox",
   "main": "src/main.js",
   "scripts": {