Spreadsheet : Remove unnecessary use of `Dynamic` flag
Spreadsheet : Remove unnecessary use of `Dynamic` flag

This was made redundant by b9109d84198b912c317e4effc5332b48be38d2a2.

andrewkaufman/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,boberfly/gaffer,boberfly/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,hradec/gaffer,hradec/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,boberfly/gaffer,hradec/gaffer,GafferHQ/gaffer,hradec/gaffer,GafferHQ/gaffer,ImageEngine/gaffer,boberfly/gaffer,hradec/gaffer,johnhaddon/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,andrewkaufman/gaffer