Fix logic to skip columns (#4)

As written, this is a multi-comparison, rather than an integer addition
of booleans.

Author: Keno

src/debug.jl

@@ -42,7 +42,7 @@ function Base.getindex(bgpm::SystemStructurePrintMatrix, i::Integer, j::Integer)
     checkbounds(bgpm, i, j)
     if bgpm.ssa_uses === nothing
         # Skip SSAUse-related columns.
-        j += j ≥ 5 + j ≥ 11
+        j += (j ≥ 5) + (j ≥ 11)
     end
     if i <= 1
         return (Label.(("# eq", "∂ₜ", " ", " ", "%", "", "# v", "∂ₜ", " ", " ", "%")))[j]