specextract response position when background has multiple shapes

[kglotfelty]

We are getting a Warning when the background contains multiple shapes when resp_pos=REGION, but we shouldn't. The response position should only be affected by the source region, not the background.

% download_chandra_obsid 4425 evt2,asol,bpix,msk
% cat src.reg
circle(4061.5548,4036.5351,5.1111071)
% cat bkg.reg
circle(4021,4023,23.465767)
circle(4091,4077,29.702094)
% punlearn specextract
% specextract "4425/primary/acisf04425N005_evt2.fits.gz[sky=region(src.reg)]" \
  bkgfile="4425/primary/acisf04425N005_evt2.fits.gz[sky=region(bkg.reg)]" \
  out=foo weight- bkgresp- mode=h clob+
Running specextract
Version: 18 November 2022

Warning: more than 1 shape found, using the coordinates of the first defined shape
Extracting Spectra:[############################################################] 2/2

Generating Aspect Histograms & Weights Maps:[############################################################] 2/2

Generating ARFs & RMFs:[############################################################] 4/4

Grouping Spectra:[############################################################] 2/2

Adding Header Keywords:[############################################################] 2/2

It looks to be benign, but just confusing. (Helpdesk ticket 24444)

[nplee]

fixed... or at least the message is quashed for the background/no background response case, since the function's still used to get the RA and Dec to estimated a hydrogen column density.