GL: Rename PicaTexture to MaxwellTexture.

src/video_core/renderer_opengl/gl_state.cpp

@@ -194,7 +194,7 @@ void OpenGLState::Apply() const {
     // Textures
     for (unsigned i = 0; i < ARRAY_SIZE(texture_units); ++i) {
         if (texture_units[i].texture_2d != cur_state.texture_units[i].texture_2d) {
-            glActiveTexture(TextureUnits::PicaTexture(i).Enum());
+            glActiveTexture(TextureUnits::MaxwellTexture(i).Enum());
             glBindTexture(GL_TEXTURE_2D, texture_units[i].texture_2d);
         }
         if (texture_units[i].sampler != cur_state.texture_units[i].sampler) {

src/video_core/renderer_opengl/gl_state.h

@@ -16,7 +16,7 @@ struct TextureUnit {
     }
 };
 
-constexpr TextureUnit PicaTexture(int unit) {
+constexpr TextureUnit MaxwellTexture(int unit) {
     return TextureUnit{unit};
 }