Update FreeFileSync to work portably

bucket/freefilesync.json

@@ -26,6 +26,9 @@
     "persist": [
       "Saved"
     ],
+    "post_install": [
+      "if (!(test-path \"$dir\\Install.dat\")) { Invoke-WebRequest -Uri 'https://bitbucket.org/kunago/scoop-bucket/raw/master/settings/freefilesync/$ver/Install.dat' -OutFile \"$dir\\Install.dat\" }"
+    ],
     "checkver": {
         "url": "https://freefilesync.org/download.php",
         "regex": "FreeFileSync\\s+([\\d.]+)\\s+Windows"

settings/freefilesync/10.24/Install.dat

@@ -0,0 +1,2 @@
+Z▌цЬ-OЖ[jД∙ipО╫╡Kчт╢
+t `Й