feat(conf2uedata): print USIM filename on display

openair3/NAS/TOOLS/display.c

@@ -64,6 +64,7 @@ int display_data_from_directory(const char *directory, int flags) {
 				display_usim_data(filename);
 				displayed_count += 1;
 				found = true;
+				printf("USIM data file: %s\n", filename);
 			}
 			free(filename);
 		}