TextSelectionDumper: fix word order for RTL text

This is used by glib backend (Evince).

Fixes issue #53
7 jobs for rtl_copy_fix in 4 minutes and 45 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #7964722
build

00:03:51

passed #7964727
build_android

00:00:45

passed #7964723
build_clang_libcpp

00:04:45

passed #7964726
build_clazy

00:04:11

passed #7964725
build_mingw64_fedora

00:02:43

passed #7964724
build_ubuntu_18_04

00:02:27

passed #7964721
clang_format

00:01:02