change bounds for x2

https://github.com/facebook/Ax/blob/6612eeaa7306530cad3089dd1d696a2dd5f47c34/ax/utils/measurement/synthetic_functions.py#L256

app.py

@@ -16,7 +16,7 @@ iface = gr.Interface(
     fn=branin,
     inputs=[
         gr.Number(0.25, label="x1", minimum=-5.0, maximum=10.0),
-        gr.Number(0.75, label="x2", minimum=0.0, maximum=10.0),
+        gr.Number(0.75, label="x2", minimum=0.0, maximum=15.0),
     ],
     outputs=gr.Number(branin(0.25, 0.75), label="branin function value"),
     description="""