minor #42010 Improve usage of twig ternary (Seb33300)

This PR was merged into the 4.4 branch.

Discussion
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Improve usage of twig ternary

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | none
| License       | MIT
| Doc PR        | none

Remove useless `else` condition when using twig ternary:

> `{{ foo ? 'yes' }}` is the same as `{{ foo ? 'yes' : '' }}`

See: https://twig.symfony.com/doc/3.x/templates.html#other-operators

Commits
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4be962d323 Improve usage of twig ternary

Author: fabpot

Resources/views/Form/form_table_layout.html.twig

@@ -27,7 +27,7 @@
 {%- endblock button_row -%}
 
 {%- block hidden_row -%}
-    {%- set style = row_attr.style is defined ? (row_attr.style ~ (row_attr.style|trim|last != ';' ? '; ')) : '' -%}
+    {%- set style = row_attr.style is defined ? (row_attr.style ~ (row_attr.style|trim|last != ';' ? '; ')) -%}
     <tr{% with {attr: row_attr|merge({style: (style ~ ' display: none')|trim})} %}{{ block('attributes') }}{% endwith %}>
         <td colspan="2">
             {{- form_widget(form) -}}