Fixed simple.xsl so that it works with XSLTC (the default XSL in JDK 1.5.0_04)

If you run BibleDesktop on JDK 1.5.0_04, it uses the compiling (rather than the interpreted) version of Xalan called XSLTC. There is a problem, however, in the way that XSLTC handles this line (it causes a "cannot pop from empty stack" error):

<xsl:number level="any" from="/" format="a" />

I removed from="/", giving:

<xsl:number level="any" format="a" />

which made it work and all the numbering was correct. It might require a bit more testing, but if we can get XSLTC to work, it will speed up the program.