[Fix]fix init of convfchead

[jshilong]

Motivation

Actually, we use the xavier_uniform_ instead of xavier_normal_ before refactoring the initialization of mmdet.

    def init_weights(self):
        super(ConvFCBBoxHead, self).init_weights()
        # conv layers are already initialized by ConvModule
        for module_list in [self.shared_fcs, self.cls_fcs, self.reg_fcs]:
            for m in module_list.modules():
                if isinstance(m, nn.Linear):
                    nn.init.xavier_uniform_(m.weight)
                    nn.init.constant_(m.bias, 0)

[codecov]

Codecov Report

Merging #6624 (25ab9c6) into dev-v2.19.1 (f08548b) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           dev-v2.19.1    #6624      +/-   ##
===============================================
- Coverage        61.97%   61.97%   -0.01%     
===============================================
  Files              322      322              
  Lines            25678    25678              
  Branches          4348     4348              
===============================================
- Hits             15915    15914       -1     
  Misses            8923     8923              
- Partials           840      841       +1     

Flag	Coverage Δ
unittests	61.95% <ø> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
...et/models/roi_heads/bbox_heads/convfc_bbox_head.py	55.88% <ø> (ø)
mmdet/core/bbox/assigners/max_iou_assigner.py	72.36% <0.00%> (-1.32%)	⬇️

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