Adjustments and bug fixes for responsive optimization

【Contents of fixes】
■Fixed a bug in which the global menu was not displayed properly when viewed on a smartphone.
■Fixed a bug where widgets placed in “(left side)” of each widget space were displayed when Theme Options > Basic Settings > Layout Settings > Layout 1 (right sidebar) was selected.
■Fixes for responsive optimization of iphone6plus in landscape mode.

The following are the files that have been modified for this update.
【Corrected files】
functions/head.php
js/jscript.js
sidebar.php
style.css
widget/styled_post_list2.php

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