Generic/InlineControlStructure: fix error when handling else if

[rodrigoprimo]

Description

This PR fixes a bug in the Generic.ControlStructures.InlineControlStructure sniff where it would not handle correctly else if statements when there is a comment between the else and if tokens.

The affected code was added in squizlabs/PHP_CodeSniffer@18f98cc to fix a similar bug when there is more than one whitespace between else and if, but it failed to consider that there might be comment tokens between else and if.

This change was originally part of PR #482, but it was decided to split it into multiple smaller PRs.

Suggested changelog entry

Generic.ControlStructures.InlineControlStructure: properly handle else if statements where there is a comment between else and if

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
  • This change is only breaking for integrators, not for external standards or end-users.
• Documentation improvement

PR checklist

• I have checked there is no other PR open for the same change.
• I have read the Contribution Guidelines.
• I grant the project the right to include and distribute the code under the BSD-3-Clause license (and I have the right to grant these rights).
• I have added tests to cover my changes.
• I have verified that the code complies with the projects coding standards.
• [Required for new sniffs] I have added XML documentation for the sniff.

[jrfnl]

Thanks @rodrigoprimo !