fix(rubocop): fix violation [skip ci]

```
Offenses:
test/integration/default/controls/pkgs_spec.rb:112:9: C: [Correctable]
Layout/LineEndStringConcatenationIndentation: Align parts of a string
concatenated with backslash.
        "installed\nP.*\nS.*\nI.*\nM.*\nA.*\nVersion: #{v}"
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
```

Author: myii

test/integration/default/controls/pkgs_spec.rb

@@ -109,7 +109,7 @@
       match_string = "#{p}-.*#{v}"
     when 'debian'
       match_string = "^Package: #{p}\nStatus: hold ok "\
-        "installed\nP.*\nS.*\nI.*\nM.*\nA.*\nVersion: #{v}"
+                     "installed\nP.*\nS.*\nI.*\nM.*\nA.*\nVersion: #{v}"
     end
 
     describe file(lock_file) do