bugs in gamma-correction module

[keshav234156]

• gamma-correction is not working as expected

with gamma value of 0.5 the expected output should be

but output that is given by IS is

what i found is that we are dividing val by defaults.adjustment which is 0.2 instead it should have been an OR operator.

image-sequencer/src/modules/GammaCorrection/Module.js

Line 14 in d782c14

var val = adjustment / defaults.adjustment;

• slider is not working at all in gamma-correction module

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[keshav234156]

@jywarren @harshkhandeparkar have a look