Fix multiple flag

Author: guerler

client/src/components/RuleBuilder/SelectBasic.vue

@@ -1,7 +1,7 @@
 <template>
     <VueMultiselect
         class="select-basic"
-        :close-on-select="true"
+        :close-on-select="!multiple"
         :options="options"
         :multiple="multiple"
         :placeholder="placeholder || 'Select an option'"

lib/galaxy/selenium/navigates_galaxy.py

@@ -1212,7 +1212,7 @@ def rule_builder_remove_columns(self, column_labels, screenshot_name=None):
         with self.rule_builder_rule_editor("remove-columns") as filter_editor_element:
             column_elem = filter_editor_element.find_element(By.CSS_SELECTOR, ".rule-column-selector")
             for column_label in column_labels:
-                self.select_set_value(column_elem, column_label)
+                self.select_set_value(column_elem, column_label, multiple=True)
             self.screenshot_if(screenshot_name)
 
     def rule_builder_concatenate_columns(self, column_label_1, column_label_2, screenshot_name=None):