test: Increase image resize sleep

runtime/experiments/applications/imageresize/by_resolution/run.sh

@@ -12,7 +12,7 @@ log="$experiment_directory/log.csv"
 
 if [ "$1" != "-d" ]; then
 	SLEDGE_SANDBOX_PERF_LOG=$log PATH="$binary_directory:$PATH" LD_LIBRARY_PATH="$binary_directory:$LD_LIBRARY_PATH" sledgert "$experiment_directory/spec.json" &
-	sleep 1
+	sleep 2
 else
 	echo "Running under gdb"
 fi