Fix missing '.' in filter name

Now that PDE is shipping the jar editor I noticed since a while that a
folder/project .BndtoolsJAREditorTempFiles is shown, even though there
is a filter to hide it.

Looking a bit closer it seems to me that while it was renamed three
years ago to start with a dot the actual filterExpression was not
adjusted (only the description/name)

bndtools.jareditor/resources/plugin.xml

@@ -26,7 +26,7 @@
 				</instanceof>
 				<test
 					property="org.eclipse.core.resources.name"
-					value="BndtoolsJAREditorTempFiles">
+					value=".BndtoolsJAREditorTempFiles">
 				</test>
 			</filterExpression>
 		</commonFilter>