Fix whitespace after including a mixin (#12715)

Change-Id: I9b25968cc140a9443820a26eadb6b5a1507ad7ec

theme-compiler/src/com/vaadin/sass/internal/parser/Parser.jj

@@ -1727,6 +1727,7 @@ void includeDirective() :
     (name = property()|name = variableName(){ name = "$"+name;}
          |(name = functionName() 
            args = argValuelist()) <RPARAN>)
+    (<S>)*
     ((";"(<S>)*)+
            {documentHandler.includeDirective(name, args);}
     | <LBRACE> (<S>)* {documentHandler.startIncludeContentBlock(name);}

theme-compiler/tests/resources/automatic/css/mixin-content-parameters.css

@@ -0,0 +1,2 @@
+foo {
+  lorem: ipsum; }

theme-compiler/tests/resources/automatic/scss/mixin-content-parameters.scss

@@ -0,0 +1,9 @@
+@mixin test($foo) {
+  #{$foo} {
+    @content;
+  }
+}
+
+@include test("foo") {
+  lorem: ipsum;
+}