Enable incremental parser by default \o/

Fix test.

src/bin/expect_tests/syntax_error_tests.ml

@@ -4,7 +4,7 @@ let%expect_test _ =
   run_ligo_bad [ "compile-contract" ; "../../test/contracts/negative/error_syntax.ligo" ; "main" ] ;
   [%expect {|
     ligo: : Parse error in file "error_syntax.ligo", line 1, characters 16-17, after "bar" and before "-".
-           {}
+          15: <syntax error> {}
 
 
      If you're not sure how to fix this error, you can

src/passes/1-parser/cameligo.ml

@@ -23,7 +23,7 @@ module PreIO =
                    ~offsets:true
                    ~mode:`Point
                    ~cmd:EvalOpt.Quiet
-                   ~mono:true
+                   ~mono:false
   end
 
 module Parser =

src/passes/1-parser/pascaligo.ml

@@ -23,7 +23,7 @@ module PreIO =
                    ~offsets:true
                    ~mode:`Point
                    ~cmd:EvalOpt.Quiet
-                   ~mono:true
+                   ~mono:false
   end
 
 module Parser =

src/passes/1-parser/reasonligo.ml

@@ -26,7 +26,7 @@ module PreIO =
                    ~offsets:true
                    ~mode:`Point
                    ~cmd:EvalOpt.Quiet
-                   ~mono:true
+                   ~mono:false
   end
 
 module Parser =