MDL-65292 style: Fix all function declarations white space

This has been generated running the following Sniffs, all
them part of the Moodle's CodeSniffer standard:
- PSR12.Functions.ReturnTypeDeclaration
- PSR12.Functions.NullableTypeDeclaration
- moodle.Methods.MethodDeclarationSpacing
- Squiz.Whitespace.ScopeKeywordSpacing

All them are, exclusively, about correct spacing, so the changes
are, all them, only white space changes.

Only exceptions to the above are 3 changes what were setting the
return type in a new line, and, when that happens, the closing
parenthesis (bracket) has to go to the same line than the colon.

badges/classes/assertion.php

@@ -336,7 +336,7 @@ class core_badges_assertion {
      * @param array $json for assertion, badges, issuer.
      * @param string $type Content type.
      */
-    protected function embed_data_badge_version2 (&$json, $type = OPEN_BADGES_V2_TYPE_ASSERTION) {
+    protected function embed_data_badge_version2(&$json, $type = OPEN_BADGES_V2_TYPE_ASSERTION) {
         // Specification Version 2.0.
         if ($this->_obversion >= OPEN_BADGES_V2) {
             $badge = new badge($this->_data->id);