#598 - fixed linter warnings

...ker8/budgetmaster/database/model/v4/BackupAccount_v4.java

...er8/budgetmaster/database/model/v4/BackupCategory_v4.java

...er8/budgetmaster/database/model/v4/BackupDatabase_v4.java

...tmaster/database/model/v4/BackupRepeatingModifier_v4.java

...getmaster/database/model/v4/BackupRepeatingOption_v4.java

...ker8/budgetmaster/database/model/v5/BackupAccount_v5.java

...er8/budgetmaster/database/model/v5/BackupCategory_v5.java

...ocker8/budgetmaster/database/model/v5/BackupChart_v5.java

...er8/budgetmaster/database/model/v5/BackupDatabase_v5.java

...ocker8/budgetmaster/database/model/v5/BackupImage_v5.java

...er8/budgetmaster/database/model/v5/BackupTemplate_v5.java