Fix the array size of opencl_worker_colors

src/debug/traces/starpu_fxt.c

@@ -31,7 +31,7 @@
 
 #define CPUS_WORKER_COLORS_NB	8
 #define CUDA_WORKER_COLORS_NB	9
-#define OPENCL_WORKER_COLORS_NB 8
+#define OPENCL_WORKER_COLORS_NB 9
 #define MIC_WORKER_COLORS_NB	9
 #define SCC_WORKER_COLORS_NB	9
 #define OTHER_WORKER_COLORS_NB	4