Fix image upload modal dropzone overflow (#20102)

GitOrigin-RevId: 8caf4e631056ed00b167cff8a6cccea0e0ff8ae7

services/web/frontend/stylesheets/app/editor/file-tree.less

@@ -397,6 +397,7 @@
   padding: 0;
   table {
     width: 100%;
+    table-layout: fixed;
     td {
       vertical-align: top;
     }
@@ -538,5 +539,6 @@
 
   .uppy-Dashboard-AddFiles-title {
     width: 26em; // sized to create a wrap between the sentences
+    max-width: 100%;
   }
 }