Round up temperature step

Partially solves #2063

esphome/nspanel_esphome_core.yaml

@@ -2121,16 +2121,14 @@ script:
       - lambda: |-
           if (id(embedded_indoor_temp) or !wifi_component->is_connected() or !api_server->is_connected()) {
             const std::string temp_units = "${temp_units}";
-            if (!temp_units.empty()) {
-              const char last_char = std::tolower(temp_units.back());  // Access the last character and convert to lowercase
-              char buffer[15]; // Buffer for formatted temperature string
-              if (last_char == 'f') {
-                snprintf(buffer, sizeof(buffer), "%.0f${temp_units}", (id(temp_nspanel).state * 9.0 / 5.0) + 32); // Fahrenheit with no decimal
-              } else {
-                snprintf(buffer, sizeof(buffer), "%.1f${temp_units}", id(temp_nspanel).state); // Celsius with one decimal
-              }
-              id(disp1)->set_component_text("home.indr_temp", adjustDecimalSeparator(buffer, id(mui_decimal_separator)).c_str());
+            const bool temp_unit_fahrenheit = (temp_units == "°F" || temp_units == "F" || temp_units == "°f" || temp_units == "f");
+            char buffer[15]; // Buffer for formatted temperature string
+            if (temp_unit_fahrenheit) {
+              snprintf(buffer, sizeof(buffer), "%.0f${temp_units}", (id(temp_nspanel).state * 9.0 / 5.0) + 32); // Fahrenheit with no decimal
+            } else {
+              snprintf(buffer, sizeof(buffer), "%.1f${temp_units}", id(temp_nspanel).state); // Celsius with one decimal
             }
+            id(disp1)->set_component_text("home.indr_temp", adjustDecimalSeparator(buffer, id(mui_decimal_separator)).c_str());
           }
 
   - id: display_wrapped_text