Reword Ctrl+x description
Pressing Ctrl+x resizes the window to remove black borders, "optimal" is
not well-defined.
@@ -58,7 +58,7 @@ static void usage(const char *arg0) {
" resize window to 1:1 (pixel-perfect)\n"
"\n"
" Ctrl+x\n"
- " resize window to optimal size (remove black borders)\n"
+ " resize window to remove black borders\n"
"\n"
" Ctrl+h\n"
" Home\n"
