gitignore test.trace.db and remove it before running tests

Author: mkurz

play-scala-isolated-slick-example/.gitignore

@@ -1 +1,2 @@
 test.mv.db
+test.trace.db

play-scala-isolated-slick-example/scripts/test-sbt

@@ -3,5 +3,5 @@
 echo "+----------------------------+"
 echo "| Executing tests using sbt  |"
 echo "+----------------------------+"
-rm -f test.mv.db
+rm -f test.mv.db test.trace.db
 sbt ++$MATRIX_SCALA clean flyway/flywayMigrate slickCodegen test