Remove id for CalendarListItemSharingSearch component

[georgehrke]

fixes:

[DOM] Found 2 elements with non-unique id #users-groups-search: (More info: https://goo.gl/9p2vKq) 

We are not using the Id anywhere, not even for a label....

[codecov]

Codecov Report

Merging #2287 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2287   +/-   ##
=========================================
  Coverage     27.63%   27.63%           
  Complexity      103      103           
=========================================
  Files           144      144           
  Lines          5287     5287           
  Branches        798      798           
=========================================
  Hits           1461     1461           
  Misses         3826     3826           

Flag	Coverage Δ	Complexity Δ
#javascript	22.25% <ø> (ø)	0.00 <ø> (ø)
#php	94.41% <ø> (ø)	103.00 <ø> (ø)

Impacted Files	Coverage Δ	Complexity Δ
...ion/CalendarList/CalendarListItemSharingSearch.vue	0.00% <ø> (ø)	0.00 <0.00> (ø)

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