fix(tools/spxls): correct spx source file formatter

[aofei]

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[qiniu-prow]

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tools/spxls/internal/server/format.go:106

• The removal of name.NamePos = goptoken.NoPos could lead to incorrect positioning of variable names in the merged var block. Consider re-adding the line to ensure correct positioning.

firstVarBlock.Specs = append(firstVarBlock.Specs, valueSpec)

[qiniu-ci]

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