Fix metadata fetching for new Facebook contacts

[Robi9]

Fix for bug discussed in issue #418

[codecov]

Codecov Report

Merging #423 (aa3bff3) into main (3e4d8e1) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #423      +/-   ##
==========================================
+ Coverage   71.89%   71.92%   +0.03%     
==========================================
  Files          95       95              
  Lines        8357     8379      +22     
==========================================
+ Hits         6008     6027      +19     
- Misses       1753     1755       +2     
- Partials      596      597       +1     

Impacted Files	Coverage Δ
handlers/facebookapp/facebookapp.go	81.88% <100.00%> (+1.06%)	⬆️
backends/rapidpro/backend.go	67.01% <0.00%> (-0.18%)	⬇️
test.go	32.08% <0.00%> (-0.13%)	⬇️
backend.go	20.00% <0.00%> (ø)
handlers/whatsapp/whatsapp.go	76.95% <0.00%> (+0.04%)	⬆️

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[norkans7]

refactor those repeated to have the same code path instead of 2 entirely code paths.

[norkans7]

Looks good, thanks