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.

admin/tool/task/classes/running_tasks_table.php

@@ -85,7 +85,7 @@ class running_tasks_table extends \table_sql {
      * @param   \stdClass $row
      * @return  string
      */
-    public function col_classname($row) : string {
+    public function col_classname($row): string {
         $output = $row->classname;
         if ($row->type == 'scheduled') {
             if (class_exists($row->classname)) {
@@ -108,7 +108,7 @@ class running_tasks_table extends \table_sql {
      * @return  string
      * @throws  \coding_exception
      */
-    public function col_type($row) : string {
+    public function col_type($row): string {
         if ($row->type == 'scheduled') {
             $output = \html_writer::span(get_string('scheduled', 'tool_task'), 'badge bg-primary text-white');
         } else if ($row->type == 'adhoc') {
@@ -126,7 +126,7 @@ class running_tasks_table extends \table_sql {
      * @param   \stdClass $row
      * @return  string
      */
-    public function col_time($row) : string {
+    public function col_time($row): string {
         global $OUTPUT;
 
         $taskmethod = "{$row->type}_task_from_record";
@@ -150,7 +150,7 @@ class running_tasks_table extends \table_sql {
      * @param   \stdClass $row
      * @return  string
      */
-    public function col_timestarted($row) : string {
+    public function col_timestarted($row): string {
         return userdate($row->timestarted);
     }
 }