fix vertex shader producing an unused varying

Author: codex128

jme3-testdata/src/main/resources/Shaders/VulkanFragTest.glsl

@@ -1,6 +1,6 @@
 #version 450
 
-layout(location = 1) in vec2 texCoord;
+layout(location = 0) in vec2 texCoord;
 
 layout(location = 0) out vec4 outColor;
 

jme3-testdata/src/main/resources/Shaders/VulkanVertTest.glsl

@@ -4,8 +4,7 @@ layout (location = 0) in vec3 inPosition;
 layout (location = 1) in vec2 inTexCoord;
 layout (location = 2) in vec3 inNormal;
 
-layout (location = 0) out vec3 fragColor;
-layout (location = 1) out vec2 texCoord;
+layout (location = 0) out vec2 texCoord;
 
 layout (set = 0, binding = 0) uniform CameraBuffer {
     mat4 worldViewProjectionMatrix;