Luanti 176cadc on Linux

Description

1. Create mods/test3/mod.conf
2. Input

name = """
haha ;]
oops
"""

3. The multiline name will look weird in the menu and after opening the mod selection menu you will also get this:
   2025-09-07 12:24:08: ERROR[Main]: Invalid label element(3): '0.75,0.7;haha ;'

While there is an error if you try to activate the mod, IMO we should just filter out mods that fail validation early in the code.