Linux: Fixes #5568: Adds 'sort' to pre-release version list (#5588)

Added a 'sort by version number' to the handling of the version list when prerelease parameter ist set. 
(Assumes the latest pre-release version has a highest version number)

Joplin_install_and_update.sh

@@ -120,7 +120,7 @@ fi
 
 # Get the latest version to download
 if [[ "$INCLUDE_PRE_RELEASE" == true ]]; then
-  RELEASE_VERSION=$(wget -qO - "https://api.github.com/repos/laurent22/joplin/releases" | grep -Po '"tag_name": ?"v\K.*?(?=")' | head -1)
+  RELEASE_VERSION=$(wget -qO - "https://api.github.com/repos/laurent22/joplin/releases" | grep -Po '"tag_name": ?"v\K.*?(?=")' | sort -rV | head -1)
 else
   RELEASE_VERSION=$(wget -qO - "https://api.github.com/repos/laurent22/joplin/releases/latest" | grep -Po '"tag_name": ?"v\K.*?(?=")')
 fi