[settings][settings] Update INSTALLED_APP declaration

It now follows Django 3 way of listing ones custom
applications.

beat/web/settings/settings.py

@@ -316,25 +316,25 @@ INSTALLED_APPS = (
     "rest_framework.authtoken",
     "jsonfield",
     "actstream",
-    "beat.web.ui.registration",
-    "beat.web.accounts",
-    "beat.web.algorithms",
-    "beat.web.plotters",
-    "beat.web.attestations",
-    "beat.web.backend",
-    "beat.web.common",
-    "beat.web.databases",
-    "beat.web.dataformats",
-    "beat.web.experiments",
-    "beat.web.libraries",
-    "beat.web.navigation",
-    "beat.web.search",
-    "beat.web.statistics",
-    "beat.web.toolchains",
-    "beat.web.ui",
-    "beat.web.utils",
-    "beat.web.team",
-    "beat.web.reports",
+    "beat.web.ui.registration.apps.UiRegistrationConfig",
+    "beat.web.accounts.apps.AccountsConfig",
+    "beat.web.algorithms.apps.AlgorithmsConfig",
+    "beat.web.plotters.apps.PlottersConfig",
+    "beat.web.attestations.apps.AttestationsConfig",
+    "beat.web.backend.apps.BackendConfig",
+    "beat.web.common.apps.CommonConfig",
+    "beat.web.databases.apps.DatabasesConfig",
+    "beat.web.dataformats.apps.DataFormatsConfig",
+    "beat.web.experiments.apps.ExperimentsConfig",
+    "beat.web.libraries.apps.LibrariesConfig",
+    "beat.web.navigation.apps.NavigationConfig",
+    "beat.web.search.apps.SearchConfig",
+    "beat.web.statistics.apps.StatisticsConfig",
+    "beat.web.toolchains.apps.ToolchainsConfig",
+    "beat.web.ui.apps.UiConfig",
+    "beat.web.utils.apps.UtilsConfig",
+    "beat.web.team.apps.TeamConfig",
+    "beat.web.reports.apps.ReportsConfig",
 )
 
 # Secure re-estructured text markup parsing