fix: fix types

src/Settings.h

@@ -54,8 +54,8 @@ struct Settings {
     byte faultStateGpio = DEFAULT_OT_FAULT_STATE_GPIO;
     byte invertFaultState = false;
     unsigned int memberIdCode = 0;
-    int8_t pressureMultiplier = 1;
-    int8_t dhwFlowRateMultiplier = 1;
+    float pressureMultiplier = 1.0f;
+    float dhwFlowRateMultiplier = 1.0f;
     bool dhwPresent = true;
     bool summerWinterMode = false;
     bool heatingCh2Enabled = true;