Fixing location of "in," keyword for 08_phong

Would provide the error:
--------
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 s
hader
0:4(41): error: global variable cannot be given an explicit location in vertex s
hader
--------

For vertex shader.  Moving the "in," keyword fixes this issue
Merge pull request #3 from define-private-public/master

Fixing location of "in," keyword for 08_phong