fix(NavBar): Fixed the issue of overlapping with the control bar

[zhuozhiyongde]

在小尺寸下，这个导航栏有可能会和控制栏重叠（未hover时略显拥挤，hover时会重叠），增加了一个max函数来确定padding的最小值

Before：

After：

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[zhuozhiyongde]

其实也可以只对左侧做这个操作（这样的话右端就可以保持在低宽度时与下方进度条对齐）