reflect.Value.Bytes() should only be called when reflect.Value.Kind()…

[teejays]

Fix for issue #1345.

I noticed that in value2Interface function in session_convert.go, we are using reflect.Value.Bytes() function when the fieldType is reflect.Array OR reflect.Slice. However, go's reflect.Value.Bytes() only works when the value is of type reflect.Slice, and panics otherwise.

I would propose that change the if condition from:

if (k == reflect.Array || k == reflect.Slice) && (...) {
    // logic
}

to

if (k == reflect.Slice) && (...) {
    // logic
}

This PR fixes this.

[codecov-io]

Codecov Report

Merging #1346 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1346   +/-   ##
=======================================
  Coverage   57.48%   57.48%           
=======================================
  Files          44       44           
  Lines        7833     7833           
=======================================
  Hits         4503     4503           
  Misses       2773     2773           
  Partials      557      557

Impacted Files	Coverage Δ
session_convert.go	22.29% <100%> (ø)	⬆️
xorm.go	66.66% <0%> (ø)	⬆️

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[teejays]

Do I need to do something to pass the WIP check? :/