libobs/util: Fix reading memory usage on Linux

Memory usage displayed on Stats was too small due to a misaligned unit
of `resident_size` read from `statm` file and libobs.

libobs/util/platform-nix.c

@@ -1001,7 +1001,8 @@ bool os_get_proc_memory_usage(os_proc_memory_usage_t *usage)
 	if (!os_get_proc_memory_usage_internal(&statm))
 		return false;
 
-	usage->resident_size = statm.resident_size;
+	usage->resident_size =
+		(uint64_t)statm.resident_size * sysconf(_SC_PAGESIZE);
 	usage->virtual_size = statm.virtual_size;
 	return true;
 }
@@ -1011,7 +1012,7 @@ uint64_t os_get_proc_resident_size(void)
 	statm_t statm = {};
 	if (!os_get_proc_memory_usage_internal(&statm))
 		return 0;
-	return (uint64_t)statm.resident_size;
+	return (uint64_t)statm.resident_size * sysconf(_SC_PAGESIZE);
 }
 
 uint64_t os_get_proc_virtual_size(void)