fix script run job

Author: KirillKurdyukov

.github/workflows/slo.yml

@@ -64,8 +64,8 @@ jobs:
             --prom-pgw http://localhost:9091  \
             --report-period 250 \
             --time 600 \
-            --read-rps ${{matrix.read_rps || 1000 }} \
-            --write-rps ${{matrix.write_rps || 1000 }} \
+            --read-rps ${ matrix.read_rps } \
+            --write-rps ${ matrix.write_rps } \
             --read-timeout 1000 \
             --write-timeout 1000