Fix formatting line splits in DataDrivenDiffEq.jl

Fixed 1 instance of unnecessary line split:
- lib/DataDrivenSparse/test/cartpole.jl: Fixed 1 complex mathematical expression with division operation in cartpole dynamics

The change follows Catalyst.jl PR #1306 guidelines to improve readability
by keeping semantically related expressions on single lines while staying
under 120 character limits.

Related to: JuliaFormatter.jl PR #934

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: claude

lib/DataDrivenSparse/test/cartpole.jl

@@ -9,8 +9,7 @@ function cart_pole(u, p, t)
     F = -0.2 + 0.5 * sin(6 * t) # the input
     du[1] = u[3]
     du[2] = u[4]
-    du[3] = -(19.62 * sin(u[1]) + sin(u[1]) * cos(u[1]) * u[3]^2 + F * cos(u[1])) /
-            (2 - cos(u[1])^2)
+    du[3] = -(19.62 * sin(u[1]) + sin(u[1]) * cos(u[1]) * u[3]^2 + F * cos(u[1])) / (2 - cos(u[1])^2)
     du[4] = -(sin(u[1]) * u[3]^2 + 9.81 * sin(u[1]) * cos(u[1]) + F) / (2 - cos(u[1])^2)
     return du
 end