remove - sign from 0.00 value string

Display.cpp

@@ -266,6 +266,9 @@ void Display::drawMode(ValueMode mode) {
 
 void Display::drawDistanceValue(float distance) {
 	String txt = String(distance, 2);
+	if (txt.equals("-0.00")) {
+		txt.replace("-", "");
+	}
 	char *s = &txt[0];
 	int16_t w = 0, h = 0;
 	u8g2_gfx.setFont(u8g2_font_logisoso22_tf);