fix: Paddings generator

[JesperBellenbaum]

Description

The paddings generator misses to import BuildContext and the extensions are set up wrong:

// What I get:
extension PaddingsWireframePrimitivesBuildContextX on BuildContext {
  PaddingsWireframePrimitives get paddingsWireframePrimitives =>
      PaddingsWireframePrimitives(numbersWireframePrimitives);
}

// What we want:
extension PaddingsWireframePrimitives1BuildContextX on BuildContext {
  PaddingsWireframePrimitives1 get paddingsWireframePrimitives1 =>
      PaddingsWireframePrimitives1(NumbersWireframePrimitives1.mode1());
}