Improve unit representation code

luna/Units.cpp

@@ -1,15 +1,14 @@
 #include <Format.h>
 #include <Units.h>
-#include <limits.h>
 
 Result<usize> to_dynamic_unit(usize value, char* buffer, size_t max)
 {
     if (value < 1024) { return string_format(buffer, max, "%u bytes", value); }
 
     const char* unit_prefixes = "KMGTPE";
-    for (int i = 40; i >= 0 && value > (0xfffccccccccccccUL >> i); i -= 10)
+    while (value > (1024 * 1024))
     {
-        value >>= 10;
+        value /= 1024;
         unit_prefixes++;
     }