Fix standards and good practices in conditional_fields.install

Problem/Motivation

conditional_fields/conditional_fields.install
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FOUND 7 ERRORS AFFECTING 5 LINES
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  1 | ERROR | [x] The PHP open tag must be followed by exactly one blank line
  5 | ERROR | [x] There must be exactly one blank line after the file comment
 24 | ERROR | [x] There should be no white space after an opening "("
 24 | ERROR | [x] There should be no white space before a closing ")"
 27 | ERROR | [x] There should be no white space after an opening "("
 27 | ERROR | [x] There should be no white space before a closing ")"
 40 | ERROR | [ ] Type hint "\Drupal\Core\Entity\Entity\EntityFormDisplay" missing for $entity
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PHPCBF CAN FIX THE 6 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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Proposed resolution

Fix standards and good practices in conditional_fields.install