QRImagick: fix square pixel draw size
#17
| Job | Run time |
|---|---|
| 12s | |
| 15s | |
| 25s | |
| 25s | |
| 33s | |
| 33s | |
| 48s | |
| 5m 41s | |
| 4m 37s | |
| 4m 30s | |
| 4m 46s | |
| 6m 19s | |
| 6m 45s | |
| 5m 46s | |
| 8m 53s | |
| 50m 28s |