Revert max-width set on mermaid charts

This reverts commit 07f5ccbe.

app/assets/javascripts/behaviors/markdown/render_mermaid.js

@@ -82,7 +82,7 @@ function renderMermaidEl(el) {
       return;
     }
 
-    svg.classList.add('mermaid', 'mw-100');
+    svg.classList.add('mermaid');
 
     // pre > code > svg
     svg.closest('pre').replaceWith(svg);

ee/changelogs/unreleased/37282-mermaid-diagram-scaling-fix.yml

----
-title: Force mermaid diagrams to be scaled to fit within browser window when used in markdown
-merge_request: 25016
-author: Christopher Stryker
-type: fixed