chore(core): remove unused constants

[no changelog]

core/embed/lib/buffers.c

@@ -22,9 +22,6 @@
 #include "fonts/fonts.h"
 #include "memzero.h"
 
-const int32_t text_buffer_height = FONT_MAX_HEIGHT;
-const int32_t buffer_width = DISPLAY_RESX;
-
 #define CONCAT_(a, b) a##b
 #define CONCAT(a, b) CONCAT_(a, b)
 

core/embed/lib/buffers.h

@@ -85,9 +85,6 @@ typedef __attribute__((aligned(4))) struct {
   uint16_t buffer[3][BUFFER_PIXELS];
 } buffer_blurring_totals_t;
 
-extern const int32_t text_buffer_height;
-extern const int32_t buffer_width;
-
 buffer_line_16bpp_t* buffers_get_line_16bpp(bool clear);
 void buffers_free_line_16bpp(buffer_line_16bpp_t* buffer);