fix DumpDataCollectorTest after CS changes

Modify the expected line value which was affected by the move of the
`__LINE__` constant in #12872 to make tests pass again.

Author: xabbuh

Tests/DataCollector/DumpDataCollectorTest.php

@@ -30,7 +30,7 @@ public function testDump()
         $this->assertSame('dump', $collector->getName());
 
         $collector->dump($data);
-        $line = __LINE__;
+        $line = __LINE__ - 1;
         $this->assertSame(1, $collector->getDumpsCount());
 
         $dump = $collector->getDumps('html');
@@ -63,7 +63,7 @@ public function testFlush()
         $data = new Data(array(array(456)));
         $collector = new DumpDataCollector();
         $collector->dump($data);
-        $line = __LINE__;
+        $line = __LINE__ - 1;
 
         ob_start();
         $collector = null;