route the unknown-data-type message through the logger

save_display_data_as_text printed via the removed log() helper;
use logger.warning instead so the message lands in the log window.

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

src/damaris/gui/DamarisGUI.py

@@ -3740,7 +3740,7 @@ class MonitorWidgets:
             # nothing to save
             return
         if not hasattr( data_to_save[ 1 ], "write_to_csv" ):
-            log( "do not know how to save %s of class/type %s" % (data_to_save[ 0 ], type( data_to_save[ 1 ] )) )
+            logger.warning( "do not know how to save %s of class/type %s" % (data_to_save[ 0 ], type( data_to_save[ 1 ] )) )
             return
 
         # save them to a temporary file (in memory)