terraform: fix crasher in TestProcessIgnoreChanges
terraform: fix crasher in TestProcessIgnoreChanges

Since this test case is using t.Run, it must be sure to pass the nested
*testing.T over to the testDiffs function or else calls to t.Fatal will
crash the whole test process, since they would otherwise be called on the
wrong instance of *testing.T.

drebes/terraform,youhong316/terraform,heimweh/terraform,iljaskevic/terraform,VladRassokhin/terraform,brandontosch/terraform,pradeepbhadani/terraform,heimweh/terraform,pradeepbhadani/terraform,nlamirault/terraform,gechr/terraform,luis-silva/terraform,pdecat/terraform,heimweh/terraform,pryorda/terraform,drebes/terraform,ewbankkit/terraform,tommynsong/terraform,apparentlymart/terraform,drebes/terraform,tpounds/terraform,mattray/terraform,pdecat/terraform,pryorda/terraform,tpounds/terraform,brandontosch/terraform,iljaskevic/terraform,apparentlymart/terraform,apparentlymart/terraform,pdecat/terraform,luis-silva/terraform,nlamirault/terraform,heimweh/terraform,hashicorp/terraform,iljaskevic/terraform,youhong316/terraform,VladRassokhin/terraform,youhong316/terraform,VladRassokhin/terraform,mattray/terraform,pdecat/terraform,mattray/terraform,gechr/terraform,tpounds/terraform,heimweh/terraform,luis-silva/terraform,mattray/terraform,tommynsong/terraform,hashicorp/terraform,drebes/terraform,youhong316/terraform,ewbankkit/terraform,apparentlymart/terraform,brandontosch/terraform,brandontosch/terraform,rnaveiras/terraform,iljaskevic/terraform,hashicorp/terraform,ewbankkit/terraform,apparentlymart/terraform,tpounds/terraform,rnaveiras/terraform,gechr/terraform,pryorda/terraform,nlamirault/terraform,VladRassokhin/terraform,rnaveiras/terraform,brandontosch/terraform,pradeepbhadani/terraform,luis-silva/terraform,tommynsong/terraform,ewbankkit/terraform