data: add isdv4-50a0

[Tunfisch96]

Add tablet of Lenovo Yoga 370

The file isdv4-50a0.tablet is a copy with small modifications of isdv4-509d.tablet that is already in the database.

[github-actions]

Hi, there. I'm a bot and have been asked to have a look at this.

Please run the sysinfo script from https://github.com/linuxwacom/wacom-hid-descriptors and
file a new issue in that repo with the resulting sysinfo tarball. The README in that repo
has more information and instructions.

The .tablet files in this PR should then link to the sysinfo in this form:

# sysinfo.abCdE1234.tar.gz
# https://github.com/linuxwacom/wacom-hid-descriptors/issues/1234

A git grep sysinfo will show how this is currently used in existing data files.

See also https://github.com/linuxwacom/libwacom/wiki/Adding-a-new-device

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[Tunfisch96]

Added tarball I forgot according to the Wiki in this issue: linuxwacom/wacom-hid-descriptors#359

[whot]

thanks!