Replace Center justification with Left-align in the Expanded Lesson Edit Window

Replace Center justification with Left-align in the Expanded Lesson Edit Window
Fix patch:
— a/mod/lesson/renderer.php
+++ b/mod/lesson/renderer.php
@@ -283,7 +283,7 @@ class mod_lesson_renderer extends plugin_renderer_base {

$cell = new html_table_cell();
$cell->colspan = 2;

• $cell->style = 'text-align:center';
  + $cell->style = 'text-align:left';
  $cell->text = $page->contents;
  $pagetable->data[] = new html_table_row(array($cell));

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