Fix the issues reported by phpcs

Problem/Motivation

FILE: /notificationswidget/notifications_widget.install
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FOUND 3 ERRORS AFFECTING 3 LINES
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161 | ERROR | [x] Whitespace found at end of line
310 | ERROR | [x] Whitespace found at end of line
319 | 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: /notificationswidget/js/notifications.js
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FOUND 2 ERRORS AFFECTING 2 LINES
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36 | ERROR | [x] TRUE, FALSE and NULL must be uppercase; expected "FALSE" but found "false"
58 | ERROR | [x] TRUE, FALSE and NULL must be uppercase; expected "FALSE" but found "false"
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PHPCBF CAN FIX THE 2 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /notificationswidget/src/Plugin/Block/NotificationsWidgetBlock.php
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FOUND 5 ERRORS AFFECTING 5 LINES
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84 | ERROR | [x] Use null coalesce operator instead of ternary operator.
90 | ERROR | [x] Use null coalesce operator instead of ternary operator.
134 | ERROR | [x] Use null coalesce operator instead of ternary operator.
179 | ERROR | [x] Use null coalesce operator instead of ternary operator.
180 | ERROR | [x] Use null coalesce operator instead of ternary operator.
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PHPCBF CAN FIX THE 5 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE:/notificationswidget/src/Form/NotificationsWidgetSettingsForm.php
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FOUND 1 ERROR AFFECTING 1 LINE
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343 | ERROR | [x] Object operator not indented correctly; expected 15 spaces but found 14
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /notificationswidget/src/Services/NotificationsWidgetServiceInterface.php
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FOUND 2 ERRORS AFFECTING 2 LINES
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21 | ERROR | [x] Parameter comment must end with a full stop
24 | ERROR | [x] Parameter comment must end with a full stop
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PHPCBF CAN FIX THE 2 MARKED SNIFF VIOLATIONS AUTOMATICALLY

Steps to reproduce

vendor/bin/phpcbf --standard="Drupal,DrupalPractice" -n --extensions="php,module,inc,install,test,profile,theme,info,js" notificationswidget/