Set the inheritance_column on Tool to nil.
Set the inheritance_column on Tool to nil.

The type column is reserved for STI by default. This changed it to nil so that
we can use the type column to set the type of the tool. In the future, it may
make sense to use STI and revert this commit.

nellshamrell/supermarket,rafaelmagu/supermarket,rafaelmagu/supermarket,juliandunn/supermarket,chef/supermarket,robbkidd/supermarket,robbkidd/supermarket,leftathome/supermarket,juliandunn/supermarket,jzohrab/supermarket,nellshamrell/supermarket,robbkidd/supermarket,chef/supermarket,robbkidd/supermarket,jzohrab/supermarket,tas50/supermarket,rafaelmagu/supermarket,juliandunn/supermarket,chef/supermarket,dpnl87/supermarket,jzohrab/supermarket,leftathome/supermarket,rafaelmagu/supermarket,chef/supermarket,jzohrab/supermarket,nellshamrell/supermarket,dpnl87/supermarket,leftathome/supermarket,nellshamrell/supermarket,tas50/supermarket,tas50/supermarket,chef/supermarket,dpnl87/supermarket,dpnl87/supermarket,leftathome/supermarket,juliandunn/supermarket,tas50/supermarket