sp_high_school: fix metadata parsing

entries/sp_high_school/__init__.py

@@ -110,7 +110,7 @@ def parse(alts=None):
                     vs[v] = g.add_vertex()
                 v = vs[v]
                 g.vp["class"][v] = row[1]
-                g.vp["class"][v] = row[2]
+                g.vp["gender"][v] = row[2]
 
             g = Graph(g, vorder=g.vp.id)
         yield alt, g

entries/sp_high_school_new/__init__.py

@@ -75,7 +75,7 @@ def parse(alts=None):
                     vs[v] = g.add_vertex()
                 v = vs[v]
                 g.vp["class"][v] = row[1]
-                g.vp["class"][v] = row[2]
+                g.vp["gender"][v] = row[2]
 
             g = Graph(g, vorder=g.vp.id)
         yield alt, g