Reduce minimum poll period

This sensor makes sense to poll at a higher speed than 30seconds. Setting minimum to 1 to match IO-rails.

components/i2c/schema.json

@@ -29,7 +29,7 @@
         "defaultPeriod": {
           "description": "What period to the form should default to for this sensor.",
           "type": "number",
-          "minimum": 30,
+          "minimum": 1,
           "maximum": 86400
         }
       }