Apply font styles directly to spans

The universal selector was overriding this since the font styles
only applied to the div, not the span.

Fixes #5675

src/browser/renderer/dom/DomRenderer.ts

@@ -178,7 +178,7 @@ export class DomRenderer extends Disposable implements IRenderer {
 
     // Base CSS
     let styles =
-      `${this._terminalSelector} .${ROW_CONTAINER_CLASS} {` +
+      `${this._terminalSelector} .${ROW_CONTAINER_CLASS}, ${this._terminalSelector} .${ROW_CONTAINER_CLASS} span {` +
       // Disabling pointer events circumvents a browser behavior that prevents `click` events from
       // being delivered if the target element is replaced during the click. This happened due to
       // refresh() being called during the mousedown handler to start a selection.