Fixing location of "in," keyword for 08_phong

Would provide the error upon shader compilation:

    ERROR: GL shader index 1 did not compile
    shader info log for GL index 1:
    0:3(43): error: global variable cannot be given an explicit location in vertex
    shader
    0:4(41): error: global variable cannot be given an explicit location in vertex 
    shader

For the vertex shader.  Moving the "in," keyword fixes this issue.