remove blank in export header

src/main/java/analysis/AnalyseSpawnerFeatures.java

@@ -328,7 +328,7 @@ public class AnalyseSpawnerFeatures extends AquaNismsGroupProcess<DiadromousFish
 		result[0][1] = "basin_name";
 		result[0][2] = "latitude";
 		result[0][3] = "mean_age_female"; // primiparous and multiparous
-		result[0][4] = "mean_age _male"; // primiparous and multiparous
+		result[0][4] = "mean_age_male"; // primiparous and multiparous
 		result[0][5] = "pct_primiparous";
 
 		int i = 1;