Fix the vertical writing mode with horizontal scaling. #11555.

It is not valid to multiply textHScale when the writing mode is vertical.

See 9.4.4 Text Space Details, https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/PDF32000_2008.pdf#G8.1694762

src/display/canvas.js

@@ -1732,7 +1732,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
         }
       }
       if (vertical) {
-        current.y -= x * textHScale;
+        current.y -= x;
       } else {
         current.x += x * textHScale;
       }

test/pdfs/.gitignore

@@ -366,3 +366,4 @@
 !issue9972-3.pdf
 !tiling-pattern-box.pdf
 !tiling-pattern-large-steps.pdf
+!issue11555.pdf

test/pdfs/issue11555.pdf

@@ -0,0 +1,100 @@
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test/test_manifest.json

@@ -4384,5 +4384,11 @@
       "lastPage": 1,
       "link": true,
       "type": "eq"
+    },
+    {  "id": "issue11555",
+      "file": "pdfs/issue11555.pdf",
+      "md5": "f84ce8b7414f6a18e75a6ce69c902501",
+      "rounds": 1,
+      "type": "eq"
    }
 ]