test fixes

`b.click()` was using old image tag right after it was changed.

https://cockpit-logs.us-east-1.linodeobjects.com/pull-1821-1c12b895-20240819-093316-fedora-39/log.html#13-2

Test checks if a warning is displayed therefore create button should
be disabled.

https://cockpit-logs.us-east-1.linodeobjects.com/pull-1821-bfa093ee-20240819-082934-debian-testing/log.html#10-2

test/check-application

@@ -1174,7 +1174,7 @@ class TestApplication(testlib.MachineCase):
         second_tag = "localhost/copybox:latest"
         self.execute(False, f"podman tag localhost:5000/my-busybox {second_tag}")
         # expand details
-        b.click("#containers-images tr:contains('my-busybox') td.pf-v5-c-table__toggle button")
+        b.click(f"#containers-images tr:contains('{second_tag}') td.pf-v5-c-table__toggle button")
         b.wait_in_text("#containers-images tbody.pf-m-expanded tr .image-details", second_tag)
         dialog1.deleteImage(True, another=second_tag)
 
@@ -2434,7 +2434,7 @@ class TestApplication(testlib.MachineCase):
     def testCreateContainerValidation(self):
         def validateField(groupSelector, value, errorMessage, resetValue=""):
             b.set_input_text(f"{groupSelector} input", value)
-            b.wait_visible(".pf-v5-c-modal-box__footer #create-image-create-run-btn:not(:disabled)")
+            b.wait_visible(".pf-v5-c-modal-box__footer #create-image-create-run-btn:disabled")
             b.wait_in_text(f"{groupSelector} .pf-v5-c-helper-text__item-text", errorMessage)
             b.wait_visible(".pf-v5-c-modal-box__footer #create-image-create-run-btn[aria-disabled=true]")
             # Reset to acceptable value and verify the validation message is not present