fix: add post install patch back

Author: MichaelHaussmann

bucket/rez2.json

@@ -17,6 +17,7 @@
     "pre_install": [
         "if ($version -ge '3.0.0') { Remove-Item -Recurse -Force $dir; throw 'Please use \"rez\" package. This \"rez2\" is only for rez-2 versions.' }"
     ],
+    "post_install": "Remove-Item -Recurse -Force $dir/rez-$version",
     "pre_uninstall": "& del $scoopdir/shims/rez2.exe;& del $scoopdir/shims/rez2.shim",
     "autoupdate": {
         "architecture": {