Change repeat_place_time min value to 0.15

Previously it was 0.16. It is lowered to match the min value of the
repeat_dig_time setting which is 0.15.

builtin/settingtypes.txt

@@ -114,7 +114,7 @@ always_fly_fast (Always fly fast) bool true
 #    the place button.
 #
 #    Requires: keyboard_mouse
-repeat_place_time (Place repetition interval) float 0.25 0.16 2
+repeat_place_time (Place repetition interval) float 0.25 0.15 2
 
 #    The minimum time in seconds it takes between repeated node removals when
 #    holding the dig button.

minetest.conf.example

@@ -47,7 +47,7 @@
 
 #    The time in seconds it takes between repeated node placements when holding
 #    the place button.
-#    type: float min: 0.16 max: 2
+#    type: float min: 0.15 max: 2
 # repeat_place_time = 0.25
 
 #    The minimum time in seconds it takes between repeated node removals when

src/client/game.cpp

@@ -4434,7 +4434,7 @@ void Game::readSettings()
 	m_cache_enable_fog                   = g_settings->getBool("enable_fog");
 	m_cache_mouse_sensitivity            = g_settings->getFloat("mouse_sensitivity", 0.001f, 10.0f);
 	m_cache_joystick_frustum_sensitivity = std::max(g_settings->getFloat("joystick_frustum_sensitivity"), 0.001f);
-	m_repeat_place_time                  = g_settings->getFloat("repeat_place_time", 0.16f, 2.0);
+	m_repeat_place_time                  = g_settings->getFloat("repeat_place_time", 0.15f, 2.0f);
 
 	m_cache_enable_noclip                = g_settings->getBool("noclip");
 	m_cache_enable_free_move             = g_settings->getBool("free_move");