Update semantic_error.dana

Author: kostis

dana/programs-erroneous/semantic_error.dana

@@ -7,4 +7,4 @@ def main
   break             # Error: break outside loop
   continue          # Error: continue outside loop
   callMe: 10        # Error: callMe is not declared
-  return: foo(1, 2) # Error: foo is not defined
+  return: foo(1, 2) # Error: foo is not defined