GUI fix for issue "mod changes style of non-mod GUI elements"

The operator
"mySkin = HighLogic.Skin;"
copies only reference to HighLogic.Skin, not object itself.
So any changes you made with mySkin also affects HighLogic.Skin, which
changes the whole GUI of KSP

Changes of font size are commented out, because without it the text
becomes unexpectedly large