[OpenMP][Obvious] Fix incorrect variant selector in test

Summary:
This should be `kind` and not `arch`.

Author: jhuber6

openmp/libomptarget/test/api/ompx_3d.c

@@ -22,7 +22,7 @@ void foo(int device) {
 }
 
 int isGPU() { return 0; }
-#pragma omp declare variant(isGPU) match(device = {arch(gpu)})
+#pragma omp declare variant(isGPU) match(device = {kind(gpu)})
 int isGPUvariant() { return 1; }
 
 int defaultIsGPU() {

openmp/libomptarget/test/api/ompx_3d.cpp

@@ -22,7 +22,7 @@ void foo(int device) {
 }
 
 int isGPU() { return 0; }
-#pragma omp declare variant(isGPU) match(device = {arch(gpu)})
+#pragma omp declare variant(isGPU) match(device = {kind(gpu)})
 int isGPUvariant() { return 1; }
 
 int defaultIsGPU() {