Use uppercase for folder exclusion (#56)

build/config/PolicheckExclusions.xml

@@ -3,7 +3,7 @@
     <!-- Each of these exclusions is a folder name - if any folder or file starts with "\[name]", it will be skipped -->
     <Exclusion Type="FolderPathStart">.GIT|.VS|OBJ|.INFRA</Exclusion>
     <!-- Exclude docfx styles folder -->
-    <Exclusion Type="FolderPathFull">styles</Exclusion>
+    <Exclusion Type="FolderPathFull">STYLES</Exclusion>
 
     <!-- The specified file names will be skipped during the scan regardless which folder they are in -->
     <Exclusion Type="FileName">DOCFX.VENDOR.JS</Exclusion>