Squiz/ScopeKeywordSpacing: add additional tests

This commit adds a few of tests for syntaxes in which the target keywords could be used, which were so far not covered by tests:
* Tests with the `static` modifier keyword being used for closures.
* Tests with visibility keyword applied to class constants.

Author: jrfnl

src/Standards/Squiz/Tests/WhiteSpace/ScopeKeywordSpacingUnitTest.1.inc

@@ -174,3 +174,16 @@ final class FinalSpacingCorrect {
 abstract class AbstractSpacingCorrect {
     public abstract function spacingCorrect() {}
 }
+
+$closure = static function() { return 'spacing correct'; };
+$closure =   static     function() { return 'spacing incorrect'; };
+
+class ConstantVisibility {
+    public const PUBLIC_SPACING_CORRECT = true;
+    protected const PROTECTED_SPACING_CORRECT = true;
+    private const PRIVATE_SPACING_CORRECT = true;
+
+    public     const PUBLIC_SPACING_INCORRECT = true;
+    protected  const PROTECTED_SPACING_INCORRECT = true;
+    private    const PRIVATE_SPACING_INCORRECT = true;
+}

src/Standards/Squiz/Tests/WhiteSpace/ScopeKeywordSpacingUnitTest.1.inc.fixed

@@ -167,3 +167,16 @@ final class FinalSpacingCorrect {
 abstract class AbstractSpacingCorrect {
     public abstract function spacingCorrect() {}
 }
+
+$closure = static function() { return 'spacing correct'; };
+$closure =   static function() { return 'spacing incorrect'; };
+
+class ConstantVisibility {
+    public const PUBLIC_SPACING_CORRECT = true;
+    protected const PROTECTED_SPACING_CORRECT = true;
+    private const PRIVATE_SPACING_CORRECT = true;
+
+    public const PUBLIC_SPACING_INCORRECT = true;
+    protected const PROTECTED_SPACING_INCORRECT = true;
+    private const PRIVATE_SPACING_INCORRECT = true;
+}

src/Standards/Squiz/Tests/WhiteSpace/ScopeKeywordSpacingUnitTest.php

@@ -65,6 +65,10 @@ public function getErrorList($testFile='')
                 163 => 1,
                 166 => 1,
                 167 => 1,
+                179 => 1,
+                186 => 1,
+                187 => 1,
+                188 => 1,
             ];
 
         case 'ScopeKeywordSpacingUnitTest.3.inc':