ctx_config: Set CTX_RASTERIZER_AA to 5 (CTX_ANTIALIAS_GOOD)

Significantly speeds text rendering up with no noticeable
loss of quality (at least to my eye).

components/ctx/ctx_config.h

@@ -31,6 +31,7 @@
 #define CTX_LIMIT_FORMATS                  1
 #define CTX_32BIT_SEGMENTS                 0
 #define CTX_RASTERIZER                     1
+#define CTX_RASTERIZER_AA                  5
 #define CTX_ENABLE_RGB565                  1
 #define CTX_ENABLE_RGB565_BYTESWAPPED      1
 #define CTX_COMPOSITING_GROUPS             0