testing: Improve testing CRUD for reports

Ensure we don't get silent errors if the Lua code is longer than the
database column, don't leave out the first report from testing, test
fetching multiple reports.

internal/handlers/testdata_test.go

@@ -321,7 +321,7 @@ var data = []TestData{
 		reports: []handlers.Report{
 			handlers.Report{
 				UserId: 0,
-				Name:   "",
+				Name:   "Monthly Expenses",
 				Lua: `
 function account_series_map(accounts, tabulation)
     map = {}