api!(location): avoid repeating module name in function names

E.g. rename location::is_sending_locations_to_chat to location::is_sending_to_chat.
Then import only the location module and use it with location:: prefix,
similarly to how e.g. std::fs or std::tokio::fs avoids using "fs" or "file"
in function names.

src/mimefactory.rs

@@ -1829,7 +1829,7 @@ impl MimeFactory {
             parts.push(msg_kml_part);
         }
 
-        if location::is_sending_locations_to_chat(context, msg.chat_id).await?
+        if location::is_sending_to_chat(context, msg.chat_id).await?
             && let Some(part) = self.get_location_kml_part(context).await?
         {
             parts.push(part);