[mod] [fix] Timbre->Telemere appender: fix callsite coords

There was unfortunately a bug in the Timbre->Telemere appender that
was producing signals with {:line <num> :column <num> ...} keys instead
of the expected {:coords [<line-num> <column-num>] ...} key.

This commit fixes the mistake, which should help fix issues with
any downstream middleware or handlers that expect a `:coords` key.

Unfortunately this fix could break a small minority of users that
have come to expect `:line` and `:column` keys on their Timbre signals
(none of the built-in middleware or handlers do).

Apologies for the trouble!

main/src/taoensso/telemere/timbre.cljc

@@ -200,9 +200,8 @@
           :ctx+  context
 
           :ns     ?ns-str
-          :file   ?file
-          :line   ?line
-          :column ?column
+          :coords (when ?line [?line ?column])
+          :file   ?file ; Non-standard, goes to kvs
 
           :error  ?err
           :msg    (force output_)})))})