Fix idea run configs from not generating

Author: modmuss50

src/main/java/net/fabricmc/loom/configuration/ide/idea/IdeaSyncTask.java

@@ -109,6 +109,7 @@ private List<IntelijRunConfig> getRunConfigs() throws IOException {
 			irc.getRunConfigXml().set(runConfigXml);
 			irc.getExcludedLibraryPaths().set(excludedLibraryPaths);
 			irc.getLaunchFile().set(runConfigFile);
+			configs.add(irc);
 		}
 
 		return configs;