Fix a broken test.

The previous commit broke levenberg_marquardt_strategy_test due
a change in the logging string being used.

Change-Id: I6ea69c0bba195c3e7d457d509b9a6605458d69b4

internal/ceres/levenberg_marquardt_strategy_test.cc

diff --git a/internal/ceres/levenberg_marquardt_strategy_test.cc b/internal/ceres/levenberg_marquardt_strategy_test.cc
index ac7ddbc..fa81d5f 100644
--- a/internal/ceres/levenberg_marquardt_strategy_test.cc
+++ b/internal/ceres/levenberg_marquardt_strategy_test.cc
@@ -146,7 +146,7 @@
     ScopedMockLog log;
     EXPECT_CALL(log, Log(_, _, _)).Times(AnyNumber());
     EXPECT_CALL(log, Log(WARNING, _,
-                         HasSubstr("Failed to compute a finite step.")));
+                         HasSubstr("Failed to compute a step")));
 
     TrustRegionStrategy::Summary summary =
         lms.ComputeStep(pso, &dsm, &residual, x);