libcopybit: Remove usage of C2D_NO_BILINEAR_BIT

Remove usage of C2D_NO_BILINEAR_BIT in the config mask.
This enables using the BILINEAR filter for scaling and
improves the image quality

Change-Id: Ic9b61fe3ed5b16e63971fe542928640a13d92764
CRs-fixed: 453925
diff --git a/libcopybit/copybit_c2d.cpp b/libcopybit/copybit_c2d.cpp
index c186242..ce89525 100644
--- a/libcopybit/copybit_c2d.cpp
+++ b/libcopybit/copybit_c2d.cpp
@@ -1258,8 +1258,7 @@
         return COPYBIT_FAILURE;
     }
 
-    src_surface.config_mask = C2D_NO_BILINEAR_BIT | C2D_NO_ANTIALIASING_BIT |
-                              ctx->config_mask;
+    src_surface.config_mask = C2D_NO_ANTIALIASING_BIT | ctx->config_mask;
     src_surface.global_alpha = ctx->src_global_alpha;
     if (enableBlend) {
         if(src_surface.config_mask & C2D_GLOBAL_ALPHA_BIT) {