PSR2/UseDeclaration - refine testcase

While this test-case was always intended to be a parse error, it wasn't
intended to be _that_ parse error. The initial intention was that this
particular case (unfinished group) not be fixable. That was the case when the
code was initially written, but a later change enabled the auto-fixer and broke
this.

I have opened <#333> to
track the incorrect fixer changes being applied in the other parse error case.

Author: fredden

src/Standards/PSR2/Tests/Namespaces/UseDeclarationUnitTest.17.inc

@@ -1,3 +1,3 @@
 <?php
-use UnfinishedGroup\NotFixable {
+use UnfinishedGroup\NotFixable\ {
 	ClassT,