message: chore: clarify logging source field
diff: @@ -86,7 +86,7 @@ const loggerMiddleware = store => next => action => {
  };
  } else if (explore) {
  logMetadata = {
  - source: 'slice',
  + source: 'explore',
  source_id: explore.slice ? explore.slice.slice_id : 0,
  ...logMetadata,
  };
  