initial line width in Splash backend

In the Splash backend, the line width parameter is initially set to 0 but should be 1. Something like this (minimally tested):

diff --git a/splash/SplashState.cc b/splash/SplashState.cc
index 5ddd5740..e3c3f548 100644
--- a/splash/SplashState.cc
+++ b/splash/SplashState.cc
@@ -59,7 +59,7 @@ SplashState::SplashState(int width, int height, bool vectorAntialias,
   multiplyPatternAlpha = false;
   patternStrokeAlpha = 1;
   patternFillAlpha = 1;
-  lineWidth = 0;
+  lineWidth = 1;
   lineCap = splashLineCapButt;
   lineJoin = splashLineJoinMiter;
   miterLimit = 10;
@@ -112,7 +112,7 @@ SplashState::SplashState(int width, int height, bool vectorAntialias,
   multiplyPatternAlpha = false;
   patternStrokeAlpha = 1;
   patternFillAlpha = 1;
-  lineWidth = 0;
+  lineWidth = 1;
   lineCap = splashLineCapButt;
   lineJoin = splashLineJoinMiter;
   miterLimit = 10;

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