rename distro_check to package_manager_detect, as it is more in keeping with what the function actually does

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

automated install/uninstall.sh

@@ -42,8 +42,8 @@ source "${PI_HOLE_FILES_DIR}/automated install/basic-install.sh"
 # setupVars set in basic-install.sh
 source "${setupVars}"
 
-# distro_check() sourced from basic-install.sh
-distro_check
+# package_manager_detect() sourced from basic-install.sh
+package_manager_detect
 
 # Install packages used by the Pi-hole
 DEPS=("${INSTALLER_DEPS[@]}" "${PIHOLE_DEPS[@]}")
@@ -113,7 +113,7 @@ removeNoPurge() {
         fi
     fi
     echo -e "${OVER}  ${TICK} Removed Web Interface"
- 
+
     # Attempt to preserve backwards compatibility with older versions
     # to guarantee no additional changes were made to /etc/crontab after
     # the installation of pihole, /etc/crontab.pihole should be permanently