OpenGLShaderUI : Fix leading \ on Windows
#5921
| Job | Run time |
|---|---|
| 33m 36s | |
| 41m 8s | |
| 34m 26s | |
| 1h 49m 10s |
\ on Windows
#5921
| Job | Run time |
|---|---|
| 33m 36s | |
| 41m 8s | |
| 34m 26s | |
| 1h 49m 10s |