ggml: fix conv_1d result layout for batched input
The GEMM result is [OL, N, OC], not [OL, OC, N]. Reshape and permute accordingly. N == 1 path is unchanged.
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The GEMM result is [OL, N, OC], not [OL, OC, N]. Reshape and permute accordingly. N == 1 path is unchanged.