Use text cursor in placeholders for toolbar inputs

With https://crrev.com/c/6157257 the toolbar css styles were moved
to inspectorCommon.css, which now takes precedent over the
textPrompt.css. As a result, the cursor was changed to a mouse
cursor on hovering the text placeholder in toolbar inputs.

This CL adapts the toolbar css styles to correctly reflect
text cursors when hovering over placeholders (which are always
text).

Before: https://i.imgur.com/jWL094b.png
After: https://i.imgur.com/Kl9FwCI.png
Fixed: 399057160
Change-Id: Ic345a43d7b47cdee1ea1884c9311eed83e5f84df
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6308732
Commit-Queue: Simon Zünd <[email protected]>
Auto-Submit: Kim-Anh Tran <[email protected]>
Reviewed-by: Simon Zünd <[email protected]>

Author: ktran

front_end/ui/legacy/inspectorCommon.css

@@ -1005,7 +1005,7 @@ devtools-toolbar {
     flex: 1;
     overflow: hidden;
     white-space: nowrap;
-    cursor: auto;
+    cursor: text;
     color: var(--sys-color-on-surface);
   }
   /* Separator */