custom graphs: Change default value for explicit range

CMK-33524

Change-Id: Id1e19640a9c07efce9e2088286b24570d551959f

Author: si-23

packages/cmk-frontend-vue/src/graph-designer/private/ExplicitVerticalRangeEditor.vue

@@ -30,8 +30,8 @@ const props = defineProps<{
 const { lower, upper } = extractExplicitVerticalRangeBounds(
   props.graph_options?.explicit_vertical_range ?? 'auto'
 )
-const dataExplicitVerticalRangeLower = ref<number>(lower ?? 1.0)
-const dataExplicitVerticalRangeUpper = ref<number>(upper ?? 2.0)
+const dataExplicitVerticalRangeLower = ref<number>(lower ?? 0.0)
+const dataExplicitVerticalRangeUpper = ref<number>(upper ?? 1.0)
 
 const dataExplicitVerticalRange = ref<string>(
   props.graph_options?.explicit_vertical_range === 'auto' ? 'auto' : 'explicit'