tests: fix syntax error in setup.py, use default platforms

tests/setup.py

@@ -3,7 +3,7 @@ import pytest
 
 setup(
     name="panda3d-tester",
-    options = {
+    options={
         'build_apps': {
             'gui_apps': {
                 'tester': 'main.py',
@@ -12,13 +12,6 @@ setup(
                 'pandagl',
                 'p3openal_audio',
             ],
-            },
-            'platforms': [
-                'manylinux1_x86_64',
-                'macosx_10_6_x86_64',
-                'win32',
-                'win_amd64',
-            ],
         }
     }
 )