Update events.jl for InternalITP changes

Needed due to SciML/DiffEqBase.jl#1137

Author: ChrisRackauckas

test/integrators/events.jl

@@ -13,8 +13,8 @@ const alg = MethodOfSteps(Tsit5(); constrained = false)
     ts = findall(x -> x ≈ 2.6, sol1.t)
     @test length(ts) == 2
     @test sol1.u[ts[1]] == -sol1.u[ts[2]]
-    @test sol1(prevfloat(2.6);
-        continuity = :right)≈-sol1(prevfloat(2.6); continuity = :left) atol=1e-5
+    @test sol1(2.6;
+        continuity = :right)≈-sol1(2.6; continuity = :left) atol=1e-5
 
     # fails on 32bit?!
     # see https://github.com/SciML/DelayDiffEq.jl/pull/180
@@ -23,8 +23,8 @@ const alg = MethodOfSteps(Tsit5(); constrained = false)
         ts = findall(x -> x ≈ 2.6, sol2.t)
         @test length(ts) == 2
         @test sol2.u[ts[1]] == -sol2.u[ts[2]]
-        @test sol2(prevfloat(2.6); continuity = :right) ≈
-              -sol2(prevfloat(2.6); continuity = :left)
+        @test sol2(2.6; continuity = :right) ≈
+              -sol2(2.6; continuity = :left)
 
         sol3 = appxtrue(sol1, sol2)
         @test sol3.errors[:L2] < 1.5e-2