Remove path argument from cmd_execute()

It is always equal to argv[0] (or not used on Windows).

app/src/sys/win/command.c

@@ -19,8 +19,7 @@ build_cmd(char *cmd, size_t len, const char *const argv[]) {
 }
 
 enum process_result
-cmd_execute(const char *path, const char *const argv[], HANDLE *handle) {
-    (void) path;
+cmd_execute(const char *const argv[], HANDLE *handle) {
     STARTUPINFOW si;
     PROCESS_INFORMATION pi;
     memset(&si, 0, sizeof(si));