richedit: Set the default paragraph format consistently.

richedit: Set the default paragraph format consistently.

I created a function to set the default paragraph format to ensure
consistency when this is done.  This initial paragraph format is also
now more consistent with native richedit controls.  The dwMask value
always appears to have the same value when retrieved from the native
richedit controls, so all the mask values are now initialized when the
PARAFORMAT2 structure is created.