PB-61: Left Panel Search Bar Returning Results

- Reduce severity of SearchSpecialCharactersInPanel test

Author: danmooney2

app/code/Magento/PageBuilder/Test/Mftf/Test/AdminPageBuilderPanelTest.xml

@@ -164,7 +164,7 @@
             <stories value="Panel"/>
             <title value="Search using special characters in PageBuilder Panel"/>
             <description value="When searching using regular expression special characters, assert no JS errors are produced."/>
-            <severity value="CRITICAL"/>
+            <severity value="AVERAGE"/>
             <useCaseId value="PB-61"/>
             <testCaseId value="MC-21478"/>
             <group value="pagebuilder"/>