Adjust for 'refine-hetero-list-add' (#2116)

Co-authored-by: Tim Jacomb <timjacomb1@gmail.com>

Author: janfaracik

src/main/java/org/jenkinsci/test/acceptance/po/Job.java

@@ -365,7 +365,9 @@ public <T extends Parameter> T addParameter(Class<T> type) {
 
         control(by.checkbox("This project is parameterized")).check();
 
-        control(by.xpath("//button[text()='Add Parameter' and not(contains(@class, 'hetero-list-add-top'))]"))
+        control(
+                        by.xpath(
+                                "//button[normalize-space(string(.)) = 'Add Parameter' and not(contains(@class, 'hetero-list-add-top'))]"))
                 .selectDropdownMenu(type);
 
         // TODO selectDropdownMenu should not need this sleep - try and remove it