Revert "Only run ex50 for real types"

This reverts commit 84c43f7.

Author: Jeremy E Kozdon

examples/ksp/ex50.jl

@@ -172,7 +172,5 @@ function main(petsclib; comm = MPI.COMM_WORLD, options...)
 end
 
 for petsclib in PETSc.petsclibs
-    if PETSc.scalartype(petsclib) <: Real
-        main(petsclib)
-    end
+    main(petsclib)
 end