Update Windows_Dropbox_InstanceDB.smap

[chadtilbury]

Small typo fix

Description

Please include a summary of the change and (if applicable) which issue is fixed.

Checklist:

Please replace every instance of [ ] with [X]

• [NA ] I have generated a unique GUID for my Map(s)
• [X ] I have tested and validated that the new Map(s) work with test data and achieved the desired output
• [X ] I have placed the Map(s) within the .\SQLECmd\SQLMap\Maps directory
• [NA ] I have set or updated the version of my Map(s)
• [ NA] I have made an attempt to document the artifacts within the Map(s)
• [NA ] I have consulted the Guide/Template to ensure my Map(s) follow the same format

Thank you for your submission and for contributing to the DFIR community!

[AndrewRathbun]

Good catch