cap_touch_demo: fix typo, run in sim

python_payload/apps/cap_touch_demo.py

@@ -15,7 +15,7 @@ class Dot:
     def draw(self, i, ctx):
         imag = self.imag
         real = self.real
-        size = self.szie
+        size = self.size
 
         col = (1.0, 0.0, 1.0)
         if i % 2:

sim/fakes/hardware.py

@@ -401,3 +401,6 @@ def captouch_get_petal_rad(a):
 
 def captouch_get_petal_phi(a):
     return 0
+
+def captouch_get_petal_pad(i, x):
+    return 0
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