Use page width and height default constants in tests

Author: spikex

tests/PhpWord/Tests/Style/SectionTest.php

@@ -105,7 +105,7 @@ public function testPageWidth()
         // Section Settings
         $oSettings = new Section();
 
-        $this->assertEquals(11906, $oSettings->getPageSizeW());
+        $this->assertEquals(Section::DEFAULT_WIDTH, $oSettings->getPageSizeW());
         $iVal = rand(1, 1000);
         $oSettings->setSettingValue('pageSizeW', $iVal);
         $this->assertEquals($iVal, $oSettings->getPageSizeW());
@@ -119,7 +119,7 @@ public function testPageHeight()
         // Section Settings
         $oSettings = new Section();
 
-        $this->assertEquals(16838, $oSettings->getPageSizeH());
+        $this->assertEquals(Section::DEFAULT_HEIGHT, $oSettings->getPageSizeH());
         $iVal = rand(1, 1000);
         $oSettings->setSettingValue('pageSizeH', $iVal);
         $this->assertEquals($iVal, $oSettings->getPageSizeH());