BaseTools: Adjust the spaces around commas and colons

Based on "futurize -f lib2to3.fixes.fix_ws_comma"

Contributed-under: TianoCore Contribution Agreement 1.1
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>

BaseTools/Source/Python/UPT/Xml/CommonXml.py

@@ -355,7 +355,7 @@ class PackageHeaderXml(object):
     def FromXml(self, Item, Key, PackageObject2):
         if not Item:
             XmlTreeLevel = ['DistributionPackage', 'PackageSurfaceArea']
-            CheckDict = {'PackageHeader':None, }
+            CheckDict = {'PackageHeader': None, }
             IsRequiredItemListNull(CheckDict, XmlTreeLevel)
         self.PackagePath = XmlElement(Item, '%s/PackagePath' % Key)
         self.Header.FromXml(Item, Key)