Fix EDInitMod.F90 initialisation of drought deciduous variables

[mpaiao]

This fixes two local variables were not initialised before the first time being used.

Description:

During the merge of PR #958 and the mainline, many lines of code had changed the order, and this caused fnrt_drop_fraction and stem_drop_fraction to be used before they were initialised. Thanks @adrifoster for spotting it!

Collaborators:

@adrifoster @glemieux

Expectation of Answer Changes:

Checklist:

• My change requires a change to the documentation.
• I have updated the in-code documentation .AND. (the technical note .OR. the wiki) accordingly.
• I have read the CONTRIBUTING document.
• FATES PASS/FAIL regression tests were run
• If answers were expected to change, evaluation was performed and provided

Test Results:

CTSM (or) E3SM (specify which) test hash-tag:

CTSM (or) E3SM (specify which) baseline hash-tag:

FATES baseline hash-tag:

Test Output:

[glemieux]

Testing is underway.

[glemieux]

Regression testing on cheyenne and izumi against fates-sci.1.66.0_api.25.5.0-ctsm5.1.dev130 is b4b for all expected tests.

Cheyenne: /glade/u/home/glemieux/scratch/ctsm-tests/tests_pr1050-fates
Izumi: /home/glemieux/scratch/ctsm-tests/tests_pr1050-fates