BRUSSELS — Europe’s flagging economy is about to be bumped down the European Council agenda — again. Next week’s summit of EU leaders was supposed to be a chance to come up with responses to the economic malaise blighting the continent but instead it’s turning into another firefighting mission. The war in Iran is muscling out some of the longer-term issues. The meeting, on April 23-24 in Cyprus, was convened in large part to make progress on the EU’s €1.8 trillion seven-year budget, which needs