Fix leader change haven't updated prevTermLeader when lost the leader

[superchee0526]

When deploying multiple controllers, the old leader lost the leader doesn't update the preTermLeader information. This will cause later leader resume cannot be accessed.

		if c.clusterStore.IsLeader() {
			if prevTermLeader != c.clusterStore.ID() {
				c.becomeLeader(ctx, prevTermLeader)
				prevTermLeader = c.clusterStore.ID()
			}
		} else {
			if prevTermLeader != c.clusterStore.ID() {
				continue
			}
			c.suspend()
			prevTermLeader = c.clusterStore.Leader()
			logger.Get().Warn("Lost the leader, suspend the controller")
		}

1. A is leader, B is follower
2. leader change to B: A lost the leader and suspend(), however the prevTermLeader is still A
3. When A re-get the leadership, since prevTermLeader == c.clusterStore.ID(), it cannot resume the leadership

[git-hulk]

The CI failure is not related to this PR, will fix it later.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 47.44%. Comparing base (6c56470) to head (5b4791b).
⚠️ Report is 100 commits behind head on unstable.

Files with missing lines	Patch %	Lines
controller/controller.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable     #353      +/-   ##
============================================
+ Coverage     43.38%   47.44%   +4.05%     
============================================
  Files            37       45       +8     
  Lines          2971     4456    +1485     
============================================
+ Hits           1289     2114     +825     
- Misses         1544     2134     +590     
- Partials        138      208      +70     

Flag	Coverage Δ
unittests	47.44% <50.00%> (+4.05%)	⬆️

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