Fix nearley: strip paren for upper part of dd

[zmx0142857]

am input:

dd^2 (bm r) s

previous output:

\frac{ \text{d}^2 \left(\boldsymbol{ r }\right) }{ \text{d} s^2 }

fixed output:

\frac{ \text{d}^2 \boldsymbol{ r } }{ \text{d} s^2 }

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