Reversed Heuristic and Exhaustive buttons #54: fix issue and correct typo

[yuqisun]

Reproduced issue and fixed in code, will update image later:

(venv) root@ea0020241f0b kernel# more param.json
{
    "kernel": "_Z6kernelPfS_S_",
    "targetFunction": false,
    "targetNested": true,
    "targetLoopsID": [
        0
    ],
    "doCGRAMapping": true,
    "row": 2,
    "column": 2,
    "precisionAware": false,
    "heterogeneity": false,
    "isTrimmedDemo": true,
    "heuristicMapping": true,
    "parameterizableCGRA": true,
    "diagonalVectorization": false,
    "bypassConstraint": 8,
    "isStaticElasticCGRA": false,
    "ctrlMemConstraint": 8,
    "regConstraint": 12
}

[tancheng]

Thanks for the fix!