Fix upper bound for slime blob spread speed in the param editor

docs/changelog.txt

@@ -1,3 +1,13 @@
+GIT
+
+USERS
+
++ Fixed the upper bound of the slime blob's spread speed setting
+  when editing a slime blob. The valid range for this has only
+  ever been 1-4; selecting higher values would change the slime
+  blob's cycle counter and could corrupt its other settings.
+
+
 September 23rd, 2019 - MZX 2.92b
 
 This release fixes several bugs, notably 3DS and Wii rendering

src/editor/param.c

@@ -636,7 +636,7 @@ static int pe_slime_blob(struct world *mzx_world, int param)
 
   set_confirm_buttons(elements);
   elements[2] = construct_number_box(15, 6, "Spread speed: ",
-   1, 8, NUMBER_LINE, &speed);
+   1, 4, NUMBER_LINE, &speed);
   elements[3] = construct_check_box(15, 8, check_strings,
    2, 12, check_results);
 

src/game_update_board.c

@@ -798,6 +798,10 @@ void update_board(context *ctx)
               int new_x, new_y;
               current_color = level_color[level_offset];
               // Clear cycle
+              // BUG: This leaves the lowest cycle count bit set, which can't
+              // be fixed right now (compatibility). Seems like Alexis planned
+              // to extend the speed range in 2.00 but didn't fully implement
+              // it; the param dialog previously had the wrong bound too...
               current_param &= 0xC7;
 
               // Put slimes all around