Apply Runic: drop stray trailing comma in 1-arg anonymous tuples (#3440)

Runic on v7 (7d76855) flagged two files that still had `(x,) -> ...`
one-arg anonymous-function syntax where Runic wants `(x) -> ...`:

  lib/DelayDiffEq/src/functionwrapper.jl
    ($(args_wo_h...),)        → ($(args_wo_h...))
    ($(args_wo_h[2:end]...),) → ($(args_wo_h[2:end]...))

  lib/DiffEqBase/test/downstream/callback_detection.jl
    affect1 = (integ,) -> ... → affect1 = (integ) -> ...
    affect2 = (integ,) -> ... → affect2 = (integ) -> ...

The `...`/`$(args...)` splats are single-value in the first file's cases,
matching the test file's literal one-arg form; no semantic change.

Co-authored-by: ChrisRackauckas-Claude <accounts@chrisrackauckas.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 3 people

lib/DelayDiffEq/src/functionwrapper.jl

@@ -13,11 +13,11 @@ macro wrap_h(signature)
         else
             if isinplace(f)
                 let _f = f.$name, h = h
-                    ($(args_wo_h...),) -> _f($(args...))
+                    ($(args_wo_h...)) -> _f($(args...))
                 end
             else
                 let _f = f.$name, h = h
-                    ($(args_wo_h[2:end]...),) -> _f($(args[2:end]...))
+                    ($(args_wo_h[2:end]...)) -> _f($(args[2:end]...))
                 end
             end
         end

lib/DiffEqBase/test/downstream/callback_detection.jl

@@ -42,8 +42,8 @@ using OrdinaryDiffEq
         du[1] = -3sin(3t)
         du[2] = -sin(t)
     end
-    affect1 = (integ,) -> push!(record, 1)
-    affect2 = (integ,) -> push!(record, 2)
+    affect1 = (integ) -> push!(record, 1)
+    affect2 = (integ) -> push!(record, 2)
     cb1 = ContinuousCallback((u, i, integ) -> u[2], affect1, affect1; rootfind = SciMLBase.LeftRootFind, abstol = 0.0)
     cb2 = ContinuousCallback((u, i, integ) -> u[1], affect2, affect2; rootfind = SciMLBase.RightRootFind, abstol = 0.0)