remove most use of RTL_CONSTASCII_USTRINGPARAM macro

This is largely unnecessary when working with OUString

Change-Id: I3cf4d68357a43665d01162ef4a2d5346a45da9be
remove unnecessary use of OUString constructor when assigning

change code like
   aStr = OUString("xxxx");
to
   aStr = "xxxx";

Change-Id: Ib981a5cc735677ec5dba76ef9279a107d22e99d4
simplify if condition

Change-Id: I11d49a1ca721c4bc9c9e35d2735bd66e5a9c04dd