Coding standards and cleanup

Found few error/warning when checked with codesniffer for Drupal standards.

FILE: ...ktop/drupal-8-5-demo2/modules/contrib/user_plus/user_plus.module
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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 10 | WARNING | [x] Unused use statement
 37 | WARNING | [ ] Avoid backslash escaping in translatable strings
    |         |     when possible, use "" quotes instead
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...modules/user_commerce_grade/user_commerce_grade.links.action.yml
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FOUND 1 ERROR AFFECTING 1 LINE
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 5 | ERROR | [x] Expected 1 newline at end of file; 2 found
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...user_plus/modules/user_commerce_grade/user_commerce_grade.module
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FOUND 2 ERRORS AND 1 WARNING AFFECTING 3 LINES
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 30 | ERROR   | [x] Namespaced classes/interfaces/traits should be
    |         |     referenced with use statements
 47 | WARNING | [x] A comma should follow the last multiline array
    |         |     item. Found: ]
 54 | ERROR   | [x] Expected 1 newline at end of file; 0 found
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PHPCBF CAN FIX THE 3 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...s/modules/user_commerce_grade/user_commerce_grade.links.menu.yml
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FOUND 1 ERROR AFFECTING 1 LINE
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 8 | ERROR | [x] Expected 1 newline at end of file; 2 found
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...s/user_commerce_grade/src/UserCommerceGradeHtmlRouteProvider.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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  7 | WARNING | [x] Unused use statement
 23 | WARNING | [x] There must be no blank line following an inline
    |         |     comment
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PHPCBF CAN FIX THE 2 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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Time: 197ms; Memory: 8Mb