Fix brightness parsing

While debugging issues with color items I discovered that two SSE events
are sent when a slider with a color item is updated.

Item:
````
label: Debug Color 1
type: Color
category: oh:mdi:palette
groupNames: []
groupType: None
function: null
tags: []
````

Sitemap:
````
Slider item=D_Color iconcolor=["itemValue"]
````

The first event contains a state in the hsb format (`10,10,10`), the
second events contains the brightness only (`10`). Parsing an integer as
brightness failed and the slider was set to `0`.
IMO an integer in the range `0..100` can be considered as brightness.

Signed-off-by: mueller-ma <[email protected]>

mobile/src/main/java/org/openhab/habdroid/model/ParsedState.kt

@@ -140,6 +140,10 @@ data class ParsedState internal constructor(
                     // fall through
                 }
             }
+            val stateAsInt = state.toIntOrNull()
+            if (stateAsInt in 0..100) {
+                return stateAsInt
+            }
             return null
         }