Migrate EmptyContent contacts icons to material design

[GretaD]

it was changed icons from emptycontent for contacts and second column button when in mobile size

Ref nextcloud/groupware#38

[codecov]

Codecov Report

Merging #2799 (0af23a5) into main (c53a982) will decrease coverage by 0.23%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #2799      +/-   ##
============================================
- Coverage     18.23%   17.99%   -0.24%     
  Complexity      253      253              
============================================
  Files            98       99       +1     
  Lines          3187     3229      +42     
  Branches        440      449       +9     
============================================
  Hits            581      581              
- Misses         2413     2454      +41     
- Partials        193      194       +1     

Impacted Files	Coverage Δ
src/components/AppContent/ContactsContent.vue	0.00% <ø> (ø)
src/components/ContactDetails.vue	0.00% <ø> (ø)
src/components/MemberList.vue	0.00% <ø> (ø)
src/store/circles.js	4.25% <0.00%> (-0.24%)	⬇️
src/components/CircleDetails.vue	0.00% <0.00%> (ø)
...omponents/CircleDetails/CirclePasswordSettings.vue	0.00% <0.00%> (ø)

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