GetMemberPropertiesTest: add some missing array indexes expectations

This commit adds some array entries which were supposed to be expected, but missing.

The use of `assertArraySubset()` hid the fact that these entries were missing. As that assertion now needs to be replaced, these issues came to light.

Author: jrfnl

tests/Core/File/GetMemberPropertiesTest.php

@@ -764,6 +764,7 @@ public function dataGetMemberProperties()
                     'scope'           => 'public',
                     'scope_specified' => true,
                     'is_static'       => false,
+                    'is_readonly'     => false,
                     'type'            => 'Foo&Bar',
                     'nullable_type'   => false,
                 ],
@@ -774,6 +775,7 @@ public function dataGetMemberProperties()
                     'scope'           => 'public',
                     'scope_specified' => true,
                     'is_static'       => false,
+                    'is_readonly'     => false,
                     'type'            => 'Foo&Bar&Baz',
                     'nullable_type'   => false,
                 ],
@@ -784,6 +786,7 @@ public function dataGetMemberProperties()
                     'scope'           => 'public',
                     'scope_specified' => true,
                     'is_static'       => false,
+                    'is_readonly'     => false,
                     'type'            => 'int&string',
                     'nullable_type'   => false,
                 ],
@@ -794,6 +797,7 @@ public function dataGetMemberProperties()
                     'scope'           => 'public',
                     'scope_specified' => true,
                     'is_static'       => false,
+                    'is_readonly'     => false,
                     'type'            => '?Foo&Bar',
                     'nullable_type'   => true,
                 ],