Revert "uint result index"

This reverts commit 0e978786b5a8e7382005d8b1e16cfa12f3eeb775.

src/video_core/host_shaders/astc_decoder.comp

@@ -88,7 +88,7 @@ int color_bitsread = 0;
 #define VECTOR_ARRAY_SIZE DIVCEIL(ARRAY_NUM_ELEMENTS * 2, 4)
 uvec4 result_vector[VECTOR_ARRAY_SIZE];
 
-uint result_index = 0;
+int result_index = 0;
 uint result_vector_max_index;
 bool result_limit_reached = false;