Update ZeissCZIReader.java

Change log level of ZSTD1 without hi/lo flag from warning to debug. 
Rationale: The image data is still usable and valid in that case. Changing to debug information.

components/formats-gpl/src/loci/formats/in/ZeissCZIReader.java

@@ -4187,7 +4187,7 @@ public byte[] readPixelData(RandomAccessInputStream s, Region tile, byte[] buf)
             }
           }
           else {
-            LOGGER.warn("ZSTD-1 compression used, but no high/low byte unpacking");
+            LOGGER.debug("ZSTD-1 compression used, but no high/low byte unpacking");
             data = decoded;
           }