Unraid 7's React CSS overrides line-height: 1.5 on textareas to normal.
vvRestoreEditorPrefs() only called vvFontSize() for non-default sizes, so
the inline style that overrides Unraid's CSS was never set for the default
12px case — leaving Firefox to render at ~14px while our code calculated
positions at 18px, putting the cursor 2-3 lines above where clicked.
Now always calls vvFontSize() so the inline lineHeight is always forced.