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video: Bump default pixel limit to 16M pixels.

This is enough to cover both the DCI 4K (4096 × 2160) and UHD-1
(3840 × 2160) 4K monitor standards. This should be okay since 16M * 4 =
64MB of texture RAM; it's rare (according to the Steam hardware survey)
to have less than 256MB of RAM nowadays.

This is a slight tweak to the fix on #859. It shouldn't make much, if
any, visual difference over 1600x1200, but if we can make use of the
extra RAM and gain a marginal improvement then I don't see any reason
not to.

--- a/src/i_video.c

+++ b/src/i_video.c

@@ -116,7 +116,7 @@

 // Maximum number of pixels to use for intermediate scale buffer.

-static int max_scaling_buffer_pixels = 1600 * 1200;

+static int max_scaling_buffer_pixels = 16000000;

 // Run in full screen mode?  (int type for config code)

--- a/src/m_config.c

+++ b/src/m_config.c

@@ -766,8 +766,8 @@

     //!

     // Maximum number of pixels to use for intermediate scaling buffer.

     // More pixels mean that the screen can be rendered more precisely,

-    // but there are diminishing returns on quality. The default limits

-    // to a 1600x1200 buffer.

+    // but there are diminishing returns on quality. The default limits to

+    // 16,000,000 pixels, which is enough to cover 4K monitor standards.

     CONFIG_VARIABLE_INT(max_scaling_buffer_pixels),

--- a/src/setup/display.c

+++ b/src/setup/display.c

@@ -71,7 +71,7 @@

 static int fullscreen_width = 0, fullscreen_height = 0;

 static int window_width = 640, window_height = 480;

 static int startup_delay = 1000;

-static int max_scaling_buffer_pixels = 1600 * 1200;

+static int max_scaling_buffer_pixels = 16000000;

 static int usegamma = 0;

 int graphical_startup = 1;