Fix missing fallback argument for InitFromParams(::ModeResult)

[penelopeysm]

Closes #2607. Note that this requires TuringLang/DynamicPPL.jl#1171 to go through first. Hence I can't add a test. But once the DPPL one is done, I will add the following test, which works locally: Test added

julia> using Turing

julia> @model function f()
           x ~ Normal()
           return x + 1
       end
f (generic function with 2 methods)

julia> mapp = maximum_a_posteriori(f())
ModeResult with maximized lp of -0.92
[0.0]

julia> returned(f(), mapp)
1.0

[github-actions]

Turing.jl documentation for PR #2736 is available at:
https://TuringLang.github.io/Turing.jl/previews/PR2736/

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.34%. Comparing base (8b84230) to head (b657805).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/optimisation/Optimisation.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2736   +/-   ##
=======================================
  Coverage   55.34%   55.34%           
=======================================
  Files          20       20           
  Lines        1254     1254           
=======================================
  Hits          694      694           
  Misses        560      560           

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[sunxd3]

looks good in current state, will take another look once DPPL PR goes through

[penelopeysm]

@sunxd3 dppl pr went through :)

[sunxd3]

thanks, taking a look shortly

[sunxd3]

bump this too?

[penelopeysm]

I was thinking it's not really necessary to bump, since technically using the old version is still fine, you just don't get this functionality

[sunxd3]

LGTM