change tracer index extent of ecosys_source_sink_3d to ecosys_ind extent

[mnlevy1981]

Description of the issue:

will partially enable passing all blocks into ecosys_driver_set_interior without an argument copy

Version:

• CESM: 2.2
• POP2: master
• Migrating from @klindsay28's marbl-ecosys/MARBL#110, originally noted in November, 2016

Machine/Environment Description:

Machine independent

Any xml/namelist changes or SourceMods:

Problem exists out of the box