extra_manifest_application_entry fix mistake

Author: dvjdjvu

buildozer/targets/android.py

@@ -958,7 +958,7 @@ def execute_build_package(self, build_cmd):
         # support for extra-manifest-application
         extra_manifest_application_entry = self.buildozer.config.getdefault(
             'app', 'android.extra_manifest_application_entry', '')
-        if extra_manifest_application:
+        if extra_manifest_application_entry:
             cmd.append('--extra-manifest-application-entry="{}"'.format(open(extra_manifest_application_entry, 'rt').read().replace('"', '\\"')))
 
         # support for extra-manifest-application-arguments