#1128 SVG tspan style font-style bug

[Hauke Loebert]

Using 6.2.12

If you switch the font-style inside a list of tspans (to italic) you cannot switch back to normal. Every tspan is rendered italic. Its the same bug as in https://sourceforge.net/p/tcpdf/bugs/479/ for style font-weight.

<tspan font-style="italic">semper nec</tspan>
<tspan font-style="normal">libero tortor, tincidunt et, tincidunt eget,</tspan>

Might be simple to fix. Thanks! Hauke