Update to use_spitfire after merge with master

In merge a mismatch between master and branch was identified.
(use_spit_fire updated to use_spitfire)
This was found in failed testing and corrected.
With this change passed the full test suite.

Fixes:
User interface changes?: No
Code review: JK Shuman
Test suite: full suite, yellowstone
Test baseline:clm4_5_12_r195
Test namelist changes: no
Test answer changes: bit for bit
Test summary: PASS

components/clm/src/ED/fire/SFMainMod.F90

@@ -73,10 +73,10 @@ subroutine fire_model( currentSite, bc_in)
     enddo
 
     if(write_SF==1)then
-       write(fates_log(),*) 'use_ed_spit_fire',use_ed_spit_fire
+       write(fates_log(),*) 'use_ed_spitfire',use_ed_spitfire
     endif
 
-    if(use_ed_spit_fire)then
+    if(use_ed_spitfire)then
        call fire_danger_index(currentSite, bc_in)
        call wind_effect(currentSite, bc_in) 
        call charecteristics_of_fuel(currentSite)

components/clm/src/ED/main/EDInitMod.F90

@@ -8,7 +8,7 @@ module EDInitMod
   use FatesGlobals              , only : endrun => fates_endrun
   use EDTypesMod                , only : nclmax
   use FatesGlobals              , only : fates_log
-  use clm_varctl                , only : use_ed_spit_fire 
+  use clm_varctl                , only : use_ed_spitfire 
   use clm_time_manager          , only : is_restart
   use pftconMod                 , only : pftcon
   use EDEcophysConType          , only : EDecophyscon