fix: allows to build views with multiple search widgets

[ThomasP0815]

The changes in search.html are needed for proper mapping of the search criterias to the right form.

#1400

[codecov]

Codecov Report

Merging #1432 (c420b53) into master (efc6944) will decrease coverage by 2.69%.
The diff coverage is n/a.

❗ Current head c420b53 differs from pull request most recent head 24e64eb. Consider uploading reports for the commit 24e64eb to get more accurate results

@@            Coverage Diff             @@
##           master    #1432      +/-   ##
==========================================
- Coverage   75.45%   72.75%   -2.70%     
==========================================
  Files          54       46       -8     
  Lines        7870     6354    -1516     
==========================================
- Hits         5938     4623    -1315     
+ Misses       1932     1731     -201     

Flag	Coverage Δ
python	72.75% <ø> (-2.70%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
flask_appbuilder/security/manager.py	57.83% <0.00%> (-14.26%)	⬇️
flask_appbuilder/models/sqla/filters.py	71.12% <0.00%> (-5.54%)	⬇️
flask_appbuilder/models/mixins.py	69.23% <0.00%> (-4.11%)	⬇️
flask_appbuilder/cli.py	51.06% <0.00%> (-3.62%)	⬇️
flask_appbuilder/security/sqla/manager.py	66.04% <0.00%> (-1.65%)	⬇️
flask_appbuilder/security/views.py	54.59% <0.00%> (-1.37%)	⬇️
flask_appbuilder/security/api.py	82.92% <0.00%> (-0.80%)	⬇️
flask_appbuilder/api/convert.py	91.47% <0.00%> (-0.67%)	⬇️
flask_appbuilder/babel/views.py	92.30% <0.00%> (-0.55%)	⬇️
flask_appbuilder/models/group.py	72.31% <0.00%> (-0.47%)	⬇️
... and 21 more

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