Add import needed for typing hints

baseline()'s typing hint refers to testsuitedb type but there is no
import for that module. This commit fixes that.

Reviewed By: tnfchris

Differential Revision: https://reviews.llvm.org/D94840

Author: Thomas Preud'homme

lnt/server/ui/views.py

@@ -36,6 +36,7 @@
 import lnt.util.ImportData
 import lnt.util.stats
 from lnt.external.stats import stats as ext_stats
+from lnt.server.db import testsuitedb
 from lnt.server.reporting.analysis import ComparisonResult, calc_geomean
 from lnt.server.ui import util
 from lnt.server.ui.decorators import frontend, db_route, v4_route