fix: reading of price unit for text-report points to the correct data…

… node

perun/io/text_report.py

@@ -134,7 +134,7 @@ def textReport(dataNode: DataNode, mr_id: str) -> str:
         e_kWh = total_energy / (3600 * 1e3)
         kgCO2 = dataNode.metrics[MetricType.CO2].sum  # type: ignore
         money = dataNode.metrics[MetricType.MONEY].sum  # type: ignore
-        money_icon = dataNode.metadata["post-processing.price_unit"]
+        money_icon = mr_node.metadata["post-processing.price_unit"]
 
         app_summary_str = f"Application Summary\n\nThe application has been run {n_runs} times. Throughout its runtime, it has used {e_kWh:.3f} kWh, released a total of {kgCO2:.3f} kgCO2e into the atmosphere, and you paid {money:.2f} {money_icon} in electricity for it."
     else: