Remove Browser testsuite from PHPUnit config

The Browser testsuite entry was removed from phpunit.xml.dist, likely because browser tests are no longer needed or have been relocated.

Author: franbarbalopez

phpunit.xml.dist

@@ -8,9 +8,6 @@
         <testsuite name="Unit">
             <directory>tests/Unit</directory>
         </testsuite>
-        <testsuite name="Browser">
-            <directory>tests/Browser</directory>
-        </testsuite>
     </testsuites>
     <source>
         <include>