QCustomPlot: Fix commented sections to avoid compiler warnings (Minor change)

Ammar Nejatirequested to merge
fixQCustomPlot into main

Minor modifications are made to avoid the following compiler warning (due to misleading indentations):

bornagain/3rdparty/GUI/qcustomplot/qcustomplot.cpp:32092:5: warning: misleading indentation; statement is not part of the previous 'if' [-Wmisleading-indentation]
    return spNone;
    ^
Edited by Ammar Nejati

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