win-capture: Remove support for feature level 9.3

Be consistent with libobs-d3d11, which now uses 10_0 as the baseline.

plugins/win-capture/graphics-hook/d3d9-capture.cpp

@@ -113,7 +113,6 @@ const static D3D_FEATURE_LEVEL feature_levels[] = {
 	D3D_FEATURE_LEVEL_11_0,
 	D3D_FEATURE_LEVEL_10_1,
 	D3D_FEATURE_LEVEL_10_0,
-	D3D_FEATURE_LEVEL_9_3,
 };
 
 static inline bool shex_init_d3d11()

plugins/win-capture/graphics-hook/gl-capture.c

@@ -262,7 +262,6 @@ static const D3D_FEATURE_LEVEL feature_levels[] = {
 	D3D_FEATURE_LEVEL_11_0,
 	D3D_FEATURE_LEVEL_10_1,
 	D3D_FEATURE_LEVEL_10_0,
-	D3D_FEATURE_LEVEL_9_3,
 };
 
 static inline bool gl_shtex_init_d3d11(void)