scanning: Use word break for settings labels

For languages with long translations for the settings labels, this
forces them to wrap instead of pushing the dropdowns out further to the
right.

Bug: 1059779
Change-Id: I8649605d6b4812508b4ad18ac493b8e07bac91c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595475Reviewed-by: Jesse Schettler <jschettler@chromium.org>
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837823}

chromeos/components/scanning/resources/scan_settings_section.html

@@ -23,6 +23,7 @@
     flex-grow: 0;
     flex-shrink: 0;
     padding-inline-end: 20px;
+    word-break: break-word;
   }
 
   ::slotted([slot=settings]) {