Depal from dynamic CLUT: When detecting bounds, be more conservative.

Followup to #16188 .

Further fixes the lens flare.

It confused me before that there are two sections of the track on
Sunset Drive where the sun is visible, but only on the second is the
lens flare sprite actually shown, which is rather weird.

Verified that exactly the same thing happens on hardware, so it's not a
glitch!

GPU/Common/TextureCacheCommon.cpp

@@ -2243,10 +2243,19 @@ void TextureCacheCommon::ApplyTextureDepal(TexCacheEntry *entry) {
 	float v2 = texHeight;
 	if (bounds.minV < bounds.maxV) {
 		// These are already in pixel coords! Doesn't seem like we should multiply by texwidth/height.
-		u1 = bounds.minU + gstate_c.curTextureXOffset;
-		v1 = bounds.minV + gstate_c.curTextureYOffset;
-		u2 = bounds.maxU + gstate_c.curTextureXOffset;
-		v2 = bounds.maxV + gstate_c.curTextureYOffset;
+		float newU1 = bounds.minU + gstate_c.curTextureXOffset;
+		float newV1 = bounds.minV + gstate_c.curTextureYOffset;
+		float newU2 = bounds.maxU + gstate_c.curTextureXOffset + 1.0f;
+		float newV2 = bounds.maxV + gstate_c.curTextureYOffset + 1.0f;
+
+		// Only use a subregion if we're not close to at least one border. Otherwise just do the whole thing.
+		if (newU1 > 2 || newV1 > 2 || u2 < texWidth - 2 || v2 < texHeight - 2) {
+			u1 = newU1;
+			v1 = newV1;
+			u2 = newU2;
+			v2 = newV2;
+		}
+
 		// We need to reapply the texture next time since we cropped UV.
 		gstate_c.Dirty(DIRTY_TEXTURE_PARAMS);
 	}