Remove "strocnx,strocny" from stepu routine

[mhrib]

"strocnx,strocny" is not needed to be calculated in subroutine "stepu". It is also calculated in subroutine "dyn_finish" short after the EVP-loop / EAP_loop.

Removed from code in #252

[mhrib]

The calculation of "strocnx,strocny" within "stepu" subroutine in ice_dyn_shared.F90 is removed, as it is also calculated within subroutine "dyn_finish".

Removed from code in #278

[mhrib]

Issue fixed in #278.

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