Revert "spi_atk_create_socket(): escape the dbus address, just like the atspi launcher does"
Revert "spi_atk_create_socket(): escape the dbus address, just like the atspi launcher does"

The reversion makes the at-spi2-atk tests work if XDG_RUNTIME_DIR
is not set to a directory with funny characters in it.

If we unconditionally escape spi_global_app_data->app_bus_addr, then
escaped_address ends up having something like unix%3a... and these
errors:

** (app-test:939): WARNING **: 00:54:30.136: atk-bridge: Couldn't listen on dbus server: Address does not contain a colon

So, my fix for dbus's complaints about funny characters was wrong.
Let's try again.

This reverts commit 6fd1c44ad36eda5f4f6d11ffb6ef198e39364233.

GNOME/at-spi2-core,GNOME/at-spi2-core,GNOME/at-spi2-core