Invalid name in restore function

[Satsuoni]

*Describe the bug
The snapshot "save" and "restore" functions use different names for "os". ("os" and "os_context")
See this line vs this one.
Sample Code

count=[0]
def trace_cb(ql: Qiling, address: int, size: int, count):
  ql.save(reg=True, mem=True, hw=False, fd=False, cpu_context=True, os=True, loader=True,snapshot="savestate")
ql = Qiling(["x86_windows/test.exe"], "x86_windows")
ql.hook_code(trace_cb, count)
ql.run()

Then, after crash

ql = Qiling(["x86_windows/test.exe"], "x86_windows")
ql.restore("savestate")
ql.run(begin=ql.arch.regs.eip)

Expected behavior
"restore" loads os heap data.

Additional context
I had to add heap saving to windows to avoid "memory not available" errors when running restored emulation.

    def save(self) :
        ret={}
        ret["heap"]=self.heap.save()
        return ret

    def restore(self, saved_state):
        if "heap" in saved_state:
          self.heap.restore(saved_state["heap"])

[elicn]

I fixed the inconsistency in #1390 (pending).
As for the heap save and restore, all OS subclasses need to implement save and restore on their own. That worth a separated issue.