gdb/testsuite: disable progress bars for new debuginfod test

The recently added gdb.debuginfod/solib-with-dwz.exp test script
wasn't disabling progress bars.  This makes the gdb.log harder to
read.  Add the line to turn progress bars like we do in all the other
debuginfod tests.

There should be no change in what is actually being tested after this
commit.

gdb/testsuite/gdb.debuginfod/solib-with-dwz.exp

diff --git a/gdb/testsuite/gdb.debuginfod/solib-with-dwz.exp b/gdb/testsuite/gdb.debuginfod/solib-with-dwz.exp
index 82ae1b8..15ad13a 100644
--- a/gdb/testsuite/gdb.debuginfod/solib-with-dwz.exp
+++ b/gdb/testsuite/gdb.debuginfod/solib-with-dwz.exp
@@ -221,6 +221,7 @@
     # Turn on support for debuginfod.
     gdb_test_no_output "set debuginfod enabled on" \
 	"enabled debuginfod for initial test"
+    gdb_test_no_output "set progress-bars enabled off"
 
     # Now GDB is configured, load the executable.
     gdb_load $::binfile