Move dracut module from 98 ordering to the recommended 50 ordering

In dracut release v108 or later the recommended ordering for out
out of tree modules is 50. The following is a section from dracut
documentation:

> Not using the 50-59 range for out of tree dracut modules will likely
> lead to unintended errors in the initramfs generation process as your
> dracut module will either run too early or too late in the generation process.
> You have been warned.

Fixes: #3495

Author: jozzsi

Makefile-boot.am

@@ -19,7 +19,7 @@
 
 if BUILDOPT_DRACUT
 # Not using $(libdir) here is intentional, dracut modules go in prefix/lib
-dracutmoddir = $(prefix)/lib/dracut/modules.d/98ostree
+dracutmoddir = $(prefix)/lib/dracut/modules.d/50ostree
 dracutmod_SCRIPTS = src/boot/dracut/module-setup.sh
 endif
 if BUILDOPT_DRACUT_CONF