macos_installer_handler.py: Reference full diskutil path

Thanks @niklasravnsborg for the report!

CHANGELOG.md

@@ -14,6 +14,8 @@
   - Removes unsupported Metal-based wallpaper (Macintosh Wallpaper)
 - Resolve firmware upload incompatibilities on pre-2012 Macs with 2012+ Airport cards
   - Thanks @ausdauersportler for the catch!
+- Resolve `diskutil` failing to be located in the installer creation process
+  - Thanks @niklasravnsborg for the report!
 - Increment binaries:
   - PatcherSupportPkg 1.8.3 - release
 

opencore_legacy_patcher/support/macos_installer_handler.py

@@ -135,7 +135,7 @@ class InstallerCreation():
 
         with script_location.open("w") as script:
             script.write(f'''#!/bin/bash
-erase_disk='diskutil eraseDisk HFS+ OCLP-Installer {disk}'
+erase_disk='/usr/sbin/diskutil eraseDisk HFS+ OCLP-Installer {disk}'
 if $erase_disk; then
     "{createinstallmedia_path}" --volume /Volumes/OCLP-Installer --nointeraction{additional_args}
 fi