fix #H7453 - 'bonesknown' for dead hero

Dead hero's map coordinates are set to <0,0> part way through bones
creation, then were being used to record grave location for overview
feedback with "final resting place for <dead hero>" if/when another
character got those bones and found the grave (actually, spotted the
location where first hero died regardless of whether a grave gets
placed there).  Record dead hero's pre-<0,0> coordinates as intended.

Not previously noticed because in wizard mode the final resting place
becomes part of overview info as soon as bones are loaded rather than
waiting for the death location to be reached.

doc/fixes36.2

@@ -165,6 +165,9 @@ during character creation, don't unset alternate weapon when a shield gets
 	worn (was preventing knight from having lance set up as uswapwep)
 preformatted Guidebook.txt split line in middle of "' '" for #wait command
 prevent simiulated screenshot in Guidebook.txt from spanning page boundary
+overview information for former hero was not being set properly when bones
+	file was saved, so current hero coming across a dead hero's grave
+	didn't have #overview feedback augmented with "final resting place"
 
 
 Fixes to Post-3.6.1 Problems that Were Exposed Via git Repository