when location bar is given focus, temporarily show panels if hidden

Bug #1093 reports that "Opening a new tab in fullscreen mode, the address
bar is hidden, even if you press CTRL+L."

focus_location() is called from:
1. location's clear button callback
   (the location bar has to be visible already in order to have a clear
   button to trigger)
2. UI::handle when it gets KEYS_GOTO, i.e., CTRL-L
   (the current code will temporarily show the panels)
3. filemenu_cb() when "Open URL" is selected
   (the user specifically asks to type into location)
4. a_UIcmd_open_url and UIcmd_open_url_nbw when no url given
   (a window/tab without a url to open is of little use without a visible
   location bar to type into)

...so it seems good to move the code that temporarily shows panels in case 2
to focus_location().

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