Remove deprecation warning about virtual custom attributes from report_spec.rb

[lpichler]

virtual attributes in those specs did not respect REGEX of virtual custom attributes form
from #18538

@miq-bot assign @jrafanie
@miq-bot add_label technical debt

NOTE: in this file, there is still deprecation warning about

virtual_custom_attribute_CATTR:SECTION:name_of_attribute

but this is valid form so we need to update REGEX.

[miq-bot]

Checked commit lpichler@795f270 with ruby 2.4.6, rubocop 0.69.0, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 2 offenses detected

spec/models/miq_report_spec.rb

• ❗ - Line 158, Col 23 - Style/PercentLiteralDelimiters - %w-literals should be delimited by [ and ].
• ❗ - Line 160, Col 23 - Style/PercentLiteralDelimiters - %w-literals should be delimited by [ and ].