Placement::tostring Fix fmt expression

Author: PaddleStroke

src/Base/Placement.cpp

@@ -221,7 +221,7 @@ std::string Placement::toString()
     double angle;
     rot.getRawValue(axis, angle);
 
-    return fmt::format("position ({.1f}, {.1f}, {.1f}), axis ({.1f}, {.1f}, {.1f}), angle {.1f}\n",
+    return fmt::format("position ({:.1f}, {:.1f}, {:.1f}), axis ({:.1f}, {:.1f}, {:.1f}), angle {:.1f}\n",
                        pos.x,
                        pos.y,
                        pos.z,