[gnome-disk-utility] Build/install readme: Fix old description of running UDisks

[Kai Lüke <kailueke src gnome org>]

commit a625ac0f5725209bab672beaadd2c3a7285122de
Author: Kai Lüke <kailueke riseup net>
Date:   Tue Aug 11 22:19:17 2020 +0200

    Build/install readme: Fix old description of running UDisks

 INSTALL | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/INSTALL b/INSTALL
index 6f23253f..25dcf8cb 100644
--- a/INSTALL
+++ b/INSTALL
@@ -61,7 +61,7 @@ You can also install the resulting Flatpak in your system:
   flatpak --user uninstall org.gnome.DiskUtility
 
 This runs/installs GNOME Disks built against UDisks and libblockdev from git
-but if you do not start a the new udisksd with the LD_LIBRARY_PATH trick, 
+but if you do not start a the new udisksd with the bwrap trick, 
 the resulting Flatpak app will still use the UDisks version provided by the system. 
 That is because Flatpak cannot run the built UDisks as new system service.