fix WRF-CHEM errors for CCE build

[mirekand]

Fix issues found when building WRF-CHEM with CCE compiler

TYPE: no impact

KEYWORDS: CCE,errors,module_optical_averaging.F,module_mosaic_addemiss.F,Cray

SOURCE: Miroslaw Andrejczuk (HPE)

DESCRIPTION OF CHANGES:
Problem:
There were few errors reported by Cray compiler when building WRF-CHEM code. In chem/module_optical_averaging.F comma after write statements triggered error when building, and for chem/module_mosaic_addemiss.F compiler complained that because subroutine mosaic_dust_gocartemis has an optional argument an interface to this routine is needed in module itself.

Solution:
Remove commas after write statements in module_optical_averaging.F. Move END MODULE module_mosaic_addemiss statement in the file to include subroutine mosaic_dust_gocartemis in the module definition.

ISSUE: For use when this PR closes an issue.
Fixes #2252

LIST OF MODIFIED FILES:
chem/module_mosaic_addemiss.F
chem/module_optical_averaging.F

TESTS CONDUCTED:

1. With those changes I can build wrf/em_real with CCE
2. Are the Jenkins tests all passing? Wasn't run

RELEASE NOTE: Include a stand-alone message suitable for the inclusion in the minor and annual releases. A publication citation is appropriate.

[weiwangncar]

@mirekand Thanks for making the PR!

The regression test results:

Test Type              | Expected  | Received |  Failed
= = = = = = = = = = = = = = = = = = = = = = = =  = = = =
Number of Tests        : 23           24
Number of Builds       : 60           57
Number of Simulations  : 158           150        0
Number of Comparisons  : 95           86        0

Failed Simulations are: 
None
Which comparisons are not bit-for-bit: 
None