Increase threshold for ShaderRender tests

The threshold proves to be too low due to randomness of
fuzzyCompare(). Slightly increase it to make the tests
more robust.

Components: AOSP

VK-GL-CTS issue: 681

Affects (at least):
dEQP-GLES3.functional.shaders.texture_functions.*

Change-Id: I878e6a5c89673e87bcc225323ad852bc5e809e9e

modules/glshared/glsShaderRenderCase.cpp

@@ -447,7 +447,7 @@ TestNode::IterateResult ShaderRenderCase::iterate (void)
 		computeFragmentReference(refImage, quadGrid);
 
 	// Compare.
-	bool testOk = compareImages(resImage, refImage, 0.05f);
+	bool testOk = compareImages(resImage, refImage, 0.07f);
 
 	// De-initialize.
 	gl.useProgram(0);