icons: lazy fixes for icons in the Help menu
It appears that GTK+/GNOME don't have an icon with "help-browser" ID anymore, but we have exactly the icon that is needed for two menu entries. Also, the menu entry for "Search and Run..." was using a system icon for finding stuff, which looked wrong when used with a symbolic theme. We could come up with something overly clever like a dedicated CLI/terminal icon, but people would expect a magnifier instead (judging by what Blender does) and that's what we already use for the Zoom tool. Hence the lazy fix.
Showing with 3 additions and 3 deletions