[ADF-5223] Fix Amount widget styling

[davidcanonieto]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation
• Other... Please describe:

What is the current behaviour? (You can also link to an open issue here)
https://alfresco.atlassian.net/browse/ADF-5223

What is the new behaviour?
This widget wasn't representing the prefix correctly as it was hacked and hardcoded. Now it adapts to whatever currency is in use keeping the spacing in between.

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[codecov-io]

Codecov Report

Merging #6302 into develop will increase coverage by 0.29%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #6302      +/-   ##
===========================================
+ Coverage    76.28%   76.58%   +0.29%     
===========================================
  Files          864      856       -8     
  Lines        19583    19324     -259     
  Branches      3901     3822      -79     
===========================================
- Hits         14939    14799     -140     
+ Misses        3470     3369     -101     
+ Partials      1174     1156      -18     

Impacted Files	Coverage Δ
...k-filters/base-edit-task-filter-cloud.component.ts	71.83% <0.00%> (-5.41%)	⬇️
...src/lib/document-list/data/share-data-row.model.ts	73.68% <0.00%> (-2.64%)	⬇️
.../components/edit-process-filter-cloud.component.ts	72.58% <0.00%> (-2.06%)	⬇️
...s/search-date-range/search-date-range.component.ts	63.01% <0.00%> (-0.63%)	⬇️
...b/content-services/src/lib/search/search.module.ts	100.00% <0.00%> (ø)
...ontent-services/src/lib/mock/search-filter-mock.ts	100.00% <0.00%> (ø)
...d/src/lib/form/models/task-variable-cloud.model.ts	0.00% <0.00%> (ø)
.../components/search-filter/search-filter.service.ts	100.00% <0.00%> (ø)
.../components/dynamic-component/dynamic.component.ts
lib/extensions/src/lib/services/rule.service.ts
... and 19 more

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[eromano]

@davidcanonieto still a minor e2e to fix please check the travis CI