Wait in the wipe tower with a millisecond dwell on Klipper

The wipe tower's "Delay after unloading" never happened on Klipper. It was
emitted as G4 S<seconds>, and Klipper's G4 reads only the P parameter, in
milliseconds, so the pause was silently skipped. The option now produces a
dwell Klipper actually performs.

Also corrects the planner flush rationale, which cited an extruder position
reset that Klipper resolves at parse time and does not need synchronized, and
adds end-to-end coverage that slices a two-filament print and checks the
emitted wipe tower G-code on both a Klipper and a non-Klipper flavor.

No change to any other firmware flavor's output, and no shipped profile sets a
non-zero delay, so no shipped profile's output moves either.

src/libslic3r/GCode/WipeTower2.cpp

@@ -636,7 +636,7 @@ public:
 	{
         if (time==0.f)
             return *this;
-        m_gcode += "G4 S" + Slic3r::float_to_string_decimal_point(time, 3) + "\n";
+        m_gcode += wait_command(m_gcode_flavor, time);
 		return *this;
     }