Print Preview: Inherit font size and family in more settings

Changing more settings to a button that does not use the default styles
in print_preview/new/button_css.html removed the font: inherit styling.
Restore it.

Bug: 870645
Change-Id: Ic041c065f3d0f6d249a6817b740a8acaf963d38f
Reviewed-on: https://chromium-review.googlesource.com/1162079
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582985}

chrome/browser/resources/print_preview/new/more_settings.html

@@ -24,6 +24,7 @@
         box-shadow: none;
         cursor: pointer;
         display: flex;
+        font: inherit;
         margin: auto;
         min-height: 51px;
         outline: none;