Fix stretch aspect keep mode

Fix #15407
Fix #15514

drivers/gles3/rasterizer_gles3.cpp

@@ -345,7 +345,7 @@ void RasterizerGLES3::blit_render_target_to_screen(RID p_render_target, const Re
 	glBindFramebuffer(GL_READ_FRAMEBUFFER, rt->fbo);
 	glReadBuffer(GL_COLOR_ATTACHMENT0);
 	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, RasterizerStorageGLES3::system_fbo);
-	glBlitFramebuffer(0, 0, rt->width, rt->height, p_screen_rect.position.x, win_size.height - p_screen_rect.position.y - p_screen_rect.size.height, p_screen_rect.position.x + p_screen_rect.size.width, win_size.height, GL_COLOR_BUFFER_BIT, GL_NEAREST);
+	glBlitFramebuffer(0, 0, rt->width, rt->height, p_screen_rect.position.x, win_size.height - p_screen_rect.position.y - p_screen_rect.size.height, p_screen_rect.position.x + p_screen_rect.size.width, win_size.height - p_screen_rect.position.y, GL_COLOR_BUFFER_BIT, GL_NEAREST);
 
 #else
 	canvas->canvas_begin();