Fix tessellation tests do not test undefined tessLevel inputs

Fix tessellation tests do not test undefined tessLevel inputs

The spec says g gl_TessLevelOuter[2], gl_TessLevelOuter[3], and
both values in gl_TessLevelInner inputs  are undefined in tessellation
 evaluation shader, if isolines are tessellated.

To avoid testing undefined tessellation level inputs, change
the tessellated primitive type to QUADS

Affects:
KHR-GL45.tessellation_shader.tessellation_control_to_tessellation_evaluation.gl_tessLevel

Components: OpenGL

VK-GL-CTS issue: 488

Change-Id: I86616302ebb857e7421bc4248f2586ebc25729a7