Restore grass_main_0.7.png vanilla compability

Reset to the current teeworlds version. Removing the ddnet specific
extension from 2015.

929919d44b (diff-d3cf443ce462f6e0cf9543319e40497f2c93505528a40cb7d923781643094f99)

Closed #8747

```
$ wget https://raw.githubusercontent.com/teeworlds/teeworlds/a1911c8f7d8458fb4076ef8e7651e8ef5e91ab3e/datasrc/mapres/grass_main.png -O grass_main_0.7.png
$ dilate grass_main_0.7.png
```
This commit is contained in:
ChillerDragon 2024-08-17 00:36:14 +08:00
parent f057898ce0
commit 31cc4c24bf

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