fix disappearing scanned hosts

[sarahd93]

The "Hosts scanned" row in the report details was disappearing every time the page was reloading. Store count for scanned hosts in state to be able to display it the whole time.

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #2357 into gsa-20.08 will increase coverage by 0.14%.
The diff coverage is 89.70%.

@@              Coverage Diff              @@
##           gsa-20.08    #2357      +/-   ##
=============================================
+ Coverage      52.76%   52.91%   +0.14%     
=============================================
  Files           1070     1070              
  Lines          25789    25809      +20     
  Branches        7312     7320       +8     
=============================================
+ Hits           13607    13656      +49     
+ Misses         11058    11035      -23     
+ Partials        1124     1118       -6     

Impacted Files	Coverage Δ
gsa/src/gmp/commands/wizard.js	9.23% <0.00%> (ø)
gsa/src/web/pages/cpes/details.js	11.11% <ø> (ø)
gsa/src/web/pages/extras/trashactions.js	5.49% <0.00%> (ø)
gsa/src/web/pages/hosts/dialog.js	50.00% <ø> (ø)
gsa/src/web/pages/policies/detailspage.js	100.00% <ø> (ø)
gsa/src/web/pages/policies/row.js	100.00% <ø> (ø)
gsa/src/web/pages/portlists/detailspage.js	34.48% <ø> (ø)
gsa/src/web/pages/portlists/row.js	55.55% <ø> (ø)
gsa/src/web/pages/reportformats/detailspage.js	33.33% <ø> (ø)
gsa/src/web/pages/reportformats/row.js	40.00% <ø> (ø)
... and 20 more

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