replaces default Unnamed as survey name with placeholder

[whatisgalen]

Description of Change

re: #4516 replaces default "Unnamed" input value for Survey name in MSM survey designer with no value, placeholder.

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[coveralls]

Coverage remained the same at 40.477% when pulling c8ffe5b on whatisgalen:4516_galen_remove_default_survey_name into f5efbd1 on archesproject:master.