Extra paddings for face detector layers

samples/dnn/face_detector/deploy.prototxt

@@ -892,7 +892,7 @@ layer {
   }
   convolution_param {
     num_output: 128
-    pad: 0
+    pad: 1
     kernel_size: 3
     stride: 1
     weight_filler {
@@ -958,7 +958,7 @@ layer {
   }
   convolution_param {
     num_output: 128
-    pad: 0
+    pad: 1
     kernel_size: 3
     stride: 1
     weight_filler {
@@ -1786,4 +1786,4 @@ layer {
     keep_top_k: 200
     confidence_threshold: 0.01
   }
-}
+}

samples/dnn/face_detector/test.prototxt

@@ -917,7 +917,7 @@ layer {
   }
   convolution_param {
     num_output: 128
-    pad: 0
+    pad: 1
     kernel_size: 3
     stride: 1
     weight_filler {
@@ -983,7 +983,7 @@ layer {
   }
   convolution_param {
     num_output: 128
-    pad: 0
+    pad: 1
     kernel_size: 3
     stride: 1
     weight_filler {
@@ -1827,4 +1827,4 @@ layer {
     overlap_threshold: 0.5
     evaluate_difficult_gt: false
   }
-}
+}

samples/dnn/face_detector/train.prototxt

@@ -1020,7 +1020,7 @@ layer {
   }
   convolution_param {
     num_output: 128
-    pad: 0
+    pad: 1
     kernel_size: 3
     stride: 1
     weight_filler {
@@ -1086,7 +1086,7 @@ layer {
   }
   convolution_param {
     num_output: 128
-    pad: 0
+    pad: 1
     kernel_size: 3
     stride: 1
     weight_filler {
@@ -1895,4 +1895,4 @@ layer {
     ignore_cross_boundary_bbox: false
     mining_type: MAX_NEGATIVE
   }
-}
+}