tweak selected color for homeview cells

Signal/src/ViewControllers/HomeView/HomeViewCell.m

@@ -65,6 +65,10 @@ NS_ASSUME_NONNULL_BEGIN
 
     _viewConstraints = [NSMutableArray new];
 
+    UIView *selectedBackgroundView = [UIView new];
+    selectedBackgroundView.backgroundColor = UIColor.ows_tableCellSelectedBackgroundColor;
+    self.selectedBackgroundView = selectedBackgroundView;
+
     self.avatarView = [[AvatarImageView alloc] init];
     [self.contentView addSubview:self.avatarView];
     [self.avatarView autoSetDimension:ALDimensionWidth toSize:self.avatarSize];

SignalMessaging/categories/UIColor+OWS.h

@@ -31,6 +31,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property (class, readonly, nonatomic) UIColor *ows_infoMessageBorderColor;
 @property (class, readonly, nonatomic) UIColor *ows_toolbarBackgroundColor;
 @property (class, readonly, nonatomic) UIColor *ows_messageBubbleLightGrayColor;
+@property (class, readonly, nonatomic) UIColor *ows_tableCellSelectedBackgroundColor;
 
 + (UIColor *)colorWithRGBHex:(unsigned long)value;
 
@@ -45,7 +46,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (UIColor *)blendWithColor:(UIColor *)otherColor alpha:(CGFloat)alpha;
 
-#pragma mark -
+#pragma mark - Color Palette
 
 @property (class, readonly, nonatomic) UIColor *ows_signalBlueColor;
 @property (class, readonly, nonatomic) UIColor *ows_greenColor;

SignalMessaging/categories/UIColor+OWS.m

@@ -117,6 +117,11 @@ NS_ASSUME_NONNULL_BEGIN
     return [UIColor colorWithHue:240.0f / 360.0f saturation:0.02f brightness:0.92f alpha:1.0f];
 }
 
++ (UIColor *)ows_tableCellSelectedBackgroundColor
+{
+    return [[UIColor colorWithRGBHex:0x000000] colorWithAlphaComponent:0.08];
+}
+
 + (UIColor *)colorWithRGBHex:(unsigned long)value
 {
     CGFloat red = ((value >> 16) & 0xff) / 255.f;
@@ -147,7 +152,7 @@ NS_ASSUME_NONNULL_BEGIN
                            alpha:CGFloatLerp(a0, a1, alpha)];
 }
 
-#pragma mark - New Colors
+#pragma mark - Color Palette
 
 + (UIColor *)ows_signalBlueColor
 {