Update package_manager_init.sh

Author: CLHatch

.scripts/package_manager_init.sh

@@ -14,7 +14,7 @@ package_manager_init() {
     local PreferredPackageManager
     PreferredPackageManager="$(run_script 'config_get' PackageManager)"
     if [[ -n ${PreferredPackageManager} ]]; then
-        if run_script ! run_script 'package_manager_exists' "${PreferredPackageManager}"; then
+        if ! run_script 'package_manager_exists' "${PreferredPackageManager}"; then
             PM="${PreferredPackageManager}"
         else
             warn "Selected package manager '${C["UserCommand"]}${PreferredPackageManager}${NC}' not found."