[ts3server] update_ts3.sh fails when teamspeak was started with 'logappend=1'

[tam1m]

User Story

The update fails because version detection is broken.

Basic info

• Distro: [Ubuntu 19.10]
• Game: [ts3server]
• Command: [update]

Further Information

The update fails because version detection is broken. If there are more than one version string in a log file, localbuild in update_ts3.sh becomes something like this

3.9.1
3.9.1
3.9.1
3.9.1
3.9.1
3.9.1
3.9.1
3.9.1
3.9.1
3.9.1
3.9.1
3.9.1
3.9.1
3.9.1

To Reproduce

Steps to reproduce the behaviour:
start teamspeak with logappent=1
./ts3server update

Expected behaviour

Detect current installed version correctly

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