java8-jre: remove check condition which examines files that might not exist

We potentially copy some files across in the package, but only if they
exist in the relevant institutional folder. It's thus allowable for the
files not to exist.

packages/java8-jre.xml

@@ -5,13 +5,8 @@
     <variable name="version" value="251" />
 
     <check type="logical" condition="and">
-      <check type="logical" condition="and">
-        <check type="uninstall" condition="exists" path="Java 8 Update %version% (64-bit)" />
-        <check type="uninstall" condition="exists" path="Java 8 Update %version%" />
-      </check>
-      <check type="file" condition="exists" path="%programfiles%\java\jre1.8.0_%version%\lib\deployment.config"/>
-      <check type="file" condition="exists" path="%programfiles%\java\jre1.8.0_%version%\system.config"/>
-      <check type="file" condition="exists" path="%programfiles%\java\jre1.8.0_%version%\exception.sites"/>
+      <check type="uninstall" condition="exists" path="Java 8 Update %version% (64-bit)" />
+      <check type="uninstall" condition="exists" path="Java 8 Update %version%" />
     </check>
 
     <install cmd='taskkill /f /im jqs.exe /im iexplore.exe /im firefox.exe'>