app_list: Do not scale down folder header height

If the folder height is reduced too much, the page switcher icons get
cut off, and misplaced. It's safer to just keep the original folder
heaser size, as scaling it down does not get too much of the height
back.

BUG=1004705, 1004706

Change-Id: I63e65e2d9badaf4eb4b9932ad48187f9f3e13c1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810331Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697773}

ash/public/cpp/app_list/app_list_config.cc

@@ -412,8 +412,7 @@ AppListConfig::AppListConfig(const AppListConfig& base_config,
                                      scale_x,
                                      inner_tile_scale_y)),
       folder_bubble_y_offset_(base_config.folder_bubble_y_offset_),
-      folder_header_height_(
-          MinScale(base_config.folder_header_height_, scale_y, 1)),
+      folder_header_height_(base_config.folder_header_height_),
       folder_icon_dimension_(MinScale(base_config.folder_icon_dimension_,
                                       scale_x,
                                       inner_tile_scale_y)),