Changed default buffer usage type

dEQP was expecting default buffer usage to be GL_STATIC_DRAW
instead of GL_DYNAMIC_DRAW, so it was changed accordingly.

Change-Id: I5c9e31fc0791955fd32333c1479e76fbc79951a1
Reviewed-on: https://swiftshader-review.googlesource.com/3631
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
diff --git a/src/OpenGL/libGLESv2/Buffer.cpp b/src/OpenGL/libGLESv2/Buffer.cpp
index c8513cb..d89ae76 100644
--- a/src/OpenGL/libGLESv2/Buffer.cpp
+++ b/src/OpenGL/libGLESv2/Buffer.cpp
@@ -26,7 +26,7 @@
 {
     mContents = 0;
     mSize = 0;
-    mUsage = GL_DYNAMIC_DRAW;
+    mUsage = GL_STATIC_DRAW;
 	mIsMapped = false;
 	mOffset = 0;
 	mLength = 0;