Tests/LibPDF: Make pattern-type1.pdf more spec-compliant

This file was based on Example 4.23 in the PDF 1.7 spec, but
a few changes were made that broke it:

- ZapfDingbats was changed to Helvevtica (a misspelling of Helvetica)
- But it still used an /Encoding array for ZapfDingbats
- The operator stream *was* updated to draw glyphs a, b, c, d
- And pattern had no /Resources dict even though it's required per spec

Make it more like the example from the spec:

- Change the font to ZapfDingbats, and draw \001, \002, \003, \004
  in the operator stream, to match the /Encoding entry
- Give the pattern a /Resources entry. Like in the example, make it
  an indirect object reference to object 16, and add an object 16
- Update file offsets with `mutool clean` as usual

With this, the file shows card suits instead of a, b, c, d, and it
now displays fine in Preview.app. And it'll keep displaying fine
if we decide to make LibPDF stricter and more spec-compliant by
requiring /Resources too, like Preview.app seems to do.

Tests/LibPDF/pattern-type1.pdf

@@ -18,7 +18,7 @@ endobj
 endobj
 
 15 0 obj
-<</Type/Pattern/PatternType 1/PaintType 1/TilingType 2/BBox[0 0 100 100]/XStep 100/YStep 100/Matrix[.4 0 0 .4 0 0]/Length 632>>
+<</Type/Pattern/PatternType 1/PaintType 1/TilingType 2/BBox[0 0 100 100]/XStep 100/YStep 100/Matrix[.4 0 0 .4 0 0]/Resources 16 0 R/Length 643>>
 stream
 BT % Begin text object
 0.0 -0.05 TD % Move text position
@@ -27,24 +27,27 @@ BT % Begin text object
 0 Tc % Set character spacing
 0 Tw % Set word spacing
 1.0 0.0 0.0 rg % Set nonstroking colour to red
-( a ) Tj % Show spade glyph
+( \001 ) Tj % Show spade glyph
 0.7478 -0.007 TD % Move text position
 0.0 1.0 0.0 rg % Set nonstroking colour to green
-( b ) Tj % Show heart glyph
+( \002 ) Tj % Show heart glyph
 -0.7323 0.7813 TD % Move text position
 0.0 0.0 1.0 rg % Set nonstroking colour to blue
-( c ) Tj % Show diamond glyph
+( \003 ) Tj % Show diamond glyph
 0.6913 0.007 TD % Move text position
 0.0 0.0 0.0 rg % Set nonstroking colour to black
-( d ) Tj % Show club glyph
+( \004 ) Tj % Show club glyph
 ET % End text object
 
-
 endstream
 endobj
 
+16 0 obj
+<</Font<</F1 20 0 R>>>>
+endobj
+
 20 0 obj
-<</Type/Font/Subtype/Type1/Encoding 21 0 R/BaseFont/Helvevtica>>
+<</Type/Font/Subtype/Type1/Encoding 21 0 R/BaseFont/ZapfDingbats>>
 endobj
 
 21 0 obj
@@ -87,40 +90,40 @@ endobj
 
 xref
 0 31
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+0000000002 65536 f 
 0000000016 00000 n 
-0000000004 00003 f 
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 0000000062 00000 n 
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-0000000007 00003 f 
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 0000000213 00000 n 
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+0000001099 00000 n 
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+0000000027 00002 f 
+0000000028 00002 f 
+0000000029 00002 f 
+0000000000 00002 f 
+0000001295 00000 n 
 
 trailer
 <</Size 31/Root 1 0 R>>
 startxref
-2362
+2433
 %%EOF