manual-tests: fix texture path in spritegrid example


Pick-to: 6.12 6.11 6.8
Change-Id: Ic8c9c9fc5634f64b793a18c53f485f7107481480
Reviewed-by: Mike Krus <mike.krus@kdab.com>
commit72667f1229b0d233fe1bba5de9b12a50b0f6df06
parent198b5459692e65082600fa6b33df76feacad7a8d
authorMauro Persano <mauro.persano@kdab.com>
committerMauro Persano <mauro.persano@kdab.com>
commit timeWed, 9 Sep 2026 15:35:12 +0000