assets, draw: fix notices about needed mut and unneeded mut
#247
| Job | Run time |
|---|---|
| 23s | |
| 3m 29s | |
| 3m 10s | |
| 3m 33s | |
| 3m 51s | |
| 3m 49s | |
| 4m 2s | |
| 3m 45s | |
| 3m 54s | |
| 4m 0s | |
| 2m 55s | |
| 4m 15s | |
| 3m 57s | |
| 4m 39s | |
| 4m 47s | |
| 54m 29s |