[sonic-config-engine] Fix typo in hwsku name in sample graph (#10941)

Signed-off-by: Neetha John <nejo@microsoft.com>

Why I did it
There was a typo in hwsku specified as part of #10889

How I did it
Replaced with the correct hwsku

How to verify it
test_cfggen.py is passing

src/sonic-config-engine/tests/sample-graph-resource-type.xml

@@ -308,7 +308,7 @@
  <Devices>
  <Device i:type="ToRRouter">
  <Hostname>switch-t0</Hostname>
- <HwSku>Arista-7050QX-32S</HwSku>
+ <HwSku>Arista-7050-QX-32S</HwSku>
  <ClusterName>AAA00PrdStr00</ClusterName>
  </Device>
  <Device i:type="LeafRouter">
@@ -421,7 +421,7 @@
  </EthernetInterfaces>
  <FlowControl>true</FlowControl>
  <Height>0</Height>
- <HwSku>Arista-7050QX-32S</HwSku>
+ <HwSku>Arista-7050-QX-32S</HwSku>
  <ManagementInterfaces xmlns:a="http://schemas.datacontract.org/2004/07/Microsoft.Search.Autopilot.Evolution">
  <a:ManagementInterface>
  <ElementType>DeviceInterface</ElementType>
@@ -451,5 +451,5 @@
  <Properties xmlns:a="http://schemas.datacontract.org/2004/07/Microsoft.Search.Autopilot.Evolution"/>
  </MetadataDeclaration>
  <Hostname>switch-t0</Hostname>
- <HwSku>Arista-7050QX-32S</HwSku>
+ <HwSku>Arista-7050-QX-32S</HwSku>
 </DeviceMiniGraph>