!fixup promise/plugin: improve check-rx-saturated messages

slapos/promise/plugin/check_rx_saturated.py

@@ -38,11 +38,11 @@ class RunPromise(JSONPromise):
     elif saturated:
         self.logger.error(
           "RX Max dBFS: {} (RX antennas saturated, please lower rx_gain)".format(
-            ", ".join(max_rx_list)))
+            ", ".join(map("{:0.2f}".format, max_rx_list))))
     else:
         self.logger.info(
           "RX Max dBFS: {} (No saturation detected on RX antennas)".format(
-            ", ".join(max_rx_list)))
+            ", ".join(map("{:0.2f}".format, max_rx_list))))
 
   def test(self):
     """