Omit -optimize-pgf when compiling small example grammars

The minibar lets the user choose any category as the start category, but this
can lead to run-time errors for grammars compiled with -optimize-pgf.

The problem can also be observed in the GF shell. For example, 
"linearize Fish" (which means that the start category is Kind) fails for 
some languages when Foods.pgf is compiled with -optimize-pgf.

WebSetup.hs

@@ -48,7 +48,7 @@ buildWeb gf (flags,pkg,lbi) =
       where
         tmp_dir = gfo_dir</>subdir
         dir = "examples"</>subdir
-        args = numJobs flags++["-make","-s","-optimize-pgf"]
+        args = numJobs flags++["-make","-s"] -- ,"-optimize-pgf"
                ++["--gfo-dir="++tmp_dir,
                   "--gf-lib-path="++buildDir lbi </> "rgl",
                   "--name="++dropExtension pgf,