fix 'rdctl: command not found' (#91)

@cobbr2 saw this error while testing recent
[changes](b3df8cd):
```
=> Moving App 'Rancher Desktop.app' to '/Applications/Rancher Desktop.app'
:beer:  ih-rancher was successfully installed!
INFO[0000] About to launch /usr/bin/open -a /Applications/Rancher Desktop.app ...
In order to continue with Rancher configuration and be able to use this engine, some IDEs require the creation of symlinks for remote Python interpreters
Your password is required for the creation of symlink mentioned above
ln: /usr/local/bin/docker: File exists
ln: /usr/local/bin/docker-compose: File exists

Parse error: bad token
    <stdin>:1

/opt/homebrew/Cellar/ih-core/0.1.51/lib/core/rancher/step.sh: line 170: rdctl: command not found
Rancher Desktop has been installed successfully
```

rdctl should be installed at that point of the script, and `rdctl` works
for me locally.

This PR tries using `$HOME/.rd/bin/rdctl` instead.

VERSION

@@ -1 +1 @@
-0.1.51
+0.1.52

formula/ih-core.rb

@@ -1,5 +1,5 @@
 class IhCore < Formula
-  VERSION="0.1.51"
+  VERSION="0.1.52"
   desc "Brew formula for installing core tools used at Included Health engineering."
   homepage "https://github.com/ConsultingMD/homebrew-ih-public"
   license "CC BY-NC-ND 4.0"

lib/core/rancher/step.sh

@@ -167,7 +167,7 @@ function ih::setup::core.rancher::install() {
       elif ! grep -q "<string>vz</string>" "$PLIST_DST"; then
         ih::log::debug "Updating PLIST to use 'vz' for Virtualization for M3 Macs."
         sudo sed -i '' 's/<string>qemu<\/string>/<string>vz<\/string>/g' "$PLIST_DST"
-        rdctl set --experimental.virtual-machine.mount.type virtiofs
+        $HOME/.rd/bin/rdctl set --experimental.virtual-machine.mount.type virtiofs
       fi
     fi