remove unnecessary use of OUString constructor in SW module

Change-Id: I015959dce567e5579ebb5c775fb57ae14e1cd3b1
remove unnecessary use of OUString constructor in SVX module

Change-Id: I1506daaa4a3b736ee6bbb00100fca24df8368298
remove unnecessary use of OUString constructor in SVTOOLS module

Change-Id: Iad58b125f16226cc6afa9d88d2c792065bbc244f
remove unnecessary use of OUString constructor in SVL module

Change-Id: Ib3c2f2b43895fe45e9efff888bbd81d8be5969e4