Increase GLES2 fbo comparison threshold to 0.03

Bug: 26422231
Change-Id: I8c7304bbf479e4e848974fc913c564f7378f9c1d
diff --git a/modules/gles2/functional/es2fFboRenderTest.cpp b/modules/gles2/functional/es2fFboRenderTest.cpp
index 238e8a4..ec4fdc8 100644
--- a/modules/gles2/functional/es2fFboRenderTest.cpp
+++ b/modules/gles2/functional/es2fFboRenderTest.cpp
@@ -625,7 +625,7 @@
 	}
 
 	// Compare images
-	const float		threshold	= 0.02f;
+	const float		threshold	= 0.03f;
 	bool			imagesOk	= tcu::fuzzyCompare(log, "ComparisonResult", "Image comparison result", refFrame, gles2Frame, threshold, tcu::COMPARE_LOG_RESULT);
 
 	if (!imagesOk && !failReason)