test: Drop stray Enter key presses from testRunImage

These were introduced in commit a47c186 without justification,
and it's not clear what they were meant to do. Depending on the timing
they change/mess up the value in the file choosers, leading to random test
failures.

test/check-application

@@ -1952,10 +1952,8 @@ class TestApplication(testlib.MachineCase):
             b.wait_not_present('#run-image-dialog-volume-0-selinux')
 
         b.set_file_autocomplete_val("#run-image-dialog-volume-0 .pf-v5-c-select", rodir)
-        b.key("Enter")
         b.set_input_text('#run-image-dialog-volume-0-container-path', '/tmp/ro')
         ro_label = m.execute(f"ls -dZ {rodir}").split(" ")[0]
-        b.key("Enter")
         b.click('.volume-form .btn-add')
         b.wait_visible('#run-image-dialog-volume-1')
         b.click('#run-image-dialog-volume-1-btn-close')
@@ -1973,7 +1971,6 @@ class TestApplication(testlib.MachineCase):
             b.wait_not_present('#run-image-dialog-volume-2-selinux')
 
         b.set_file_autocomplete_val("#run-image-dialog-volume-2 .pf-v5-c-select", rwdir)
-        b.key("Enter")
         b.set_input_text('#run-image-dialog-volume-2-container-path', '/tmp/rw')
         rw_label = m.execute(f"ls -dZ {rwdir}").split(" ")[0]