resize should not allow negative number

[zjuasmn]

Reported URL

http://nasa-mct-notebook.herokuapp.com/

TC Number Set

TC 11-20

Reproduction Steps

1. Press Right click anywhere in Objects Context Area
2. Select 'New NoteBook Entry'
3. Enter text in 'Entry' text box
4. Select 'Link and Snapshot' from Embed Type dropdown
5. Select Annotate Button
6. Check all the fields in Annotate snapshot screen (eg. Crop, Reverse, text, enlarge, font etc)

Expected Result

All fields under Annotate Snapshot screen should work as expected

Actual Result

resize should allow negative number

Screenshots

Issue Information

Frequency: Every time

Device: iMac

OS: macOS High Sierra

Browser: Chrome v62