Update zip_codes.xml for GG & JE Postcode

* Combine updated Guernsey postcodes into 1 pattern based on feedback from "Den4ik" and limit to GY1 to GY10.
* Fix bug with Jersey postcodes not working if customers forget to add a space. 
* Tighten Jersey postcodes to JE1-JE5 e.g. https://en.wikipedia.org/wiki/JE_postcode_area

Author: DrJohnM

app/code/Magento/Directory/etc/zip_codes.xml

@@ -258,8 +258,7 @@
     </zip>
     <zip countryCode="GG">
         <codes>
-            <code id="pattern_1" active="true" example="GY1 2AB">^GY[0-9]{1}\s[0-9]{1}[a-zA-Z]{2}$</code>
-            <code id="pattern_2" active="true" example="GY10 1PB">^GY[0-9]{2}\s?[0-9]{1}[a-zA-Z]{2}$</code>
+            <code id="pattern_1" active="true" example="GY10 2AB">^GY([0-9]|10)\s?[0-9]{1}[a-zA-Z]{2}$</code>
         </codes>
     </zip>
     <zip countryCode="GH">
@@ -379,7 +378,7 @@
     </zip>
     <zip countryCode="JE">
         <codes>
-            <code id="pattern_1" active="true" example="AB1 2CD">^[a-zA-Z]{2}[0-9]{1}\s[0-9]{1}[a-zA-Z]{2}$</code>
+            <code id="pattern_1" active="true" example="JE2 4PJ">^JE[0-5]{1}\s?[0-9]{1}[a-zA-Z]{2}$</code>
         </codes>
     </zip>
     <zip countryCode="JO">