Moved up assignment so __profiler_base is always defined.

[emeryberger]

Fixes Scalene behavior for the following test case:

import os
from django.conf import settings
from django.core.wsgi import get_wsgi_application
from django.http import HttpResponse
from django.urls import path

# Settings
settings.configure(
    DEBUG=True,
    ROOT_URLCONF=__name__,
    SECRET_KEY=os.urandom(32),
    ALLOWED_HOSTS=['*'],
    WSGI_APPLICATION='__main__.application',
)

# Simple view
def hello_world(request):
    return HttpResponse("Hello, Django!")

# URL configuration
urlpatterns = [
    path('', hello_world),
]

application = get_wsgi_application()

if __name__ == "__main__":
    from django.core.management import execute_from_command_line
    execute_from_command_line([__file__, 'runserver'])